From Nanako's frame of reference the Earth is moving away

>>135662543
>Since Nanako only experiences 9 hours wouldn't Subaru's group recieve her call a split-second after she left?
No.

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Nanako experiences 9 hours, but once she emerges from near-lightspeed the entire universe has already shifted to all those months later. Her call would have been sent those months later as well, not a split second after her departure.

You were just trying to start a thread anyway, weren't you.

>>135662543
Special Relativity ignores acceleration, you need to apply GR if you to do the math properly.

>>135662746
Ironic shitposting is still shitposting

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Nanako is best Pleiades

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CUTE

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Just watched this for the space swimsuits.

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>>135663657
Swimsuits in space was probably the best fanservice idea ever, right after Vividred's school uniforms.

I'm in desperate need of comfy spess shows.

From the first of the teasers, I hoped that Comet Lucifer would be a fantasy show set on an alien planet but nope, gotta shove a mecha in there.

>>135665266
This and that Classroom Crisis would be about student engineers in the space exploration/colonization period of the world, rather than about business shenanigans that doesn't even need the space-y part to work.

VROOOOM VROOOOM to the front page

>>135665266
Watch Mouretsu Pirates.

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>>135665266
What >>135668863 said.
And now I really want to see Nanako playing space insurance fraud pirate.

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>>135669494
Just make Nanako their daughter.

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>>135669580
What if she grows up to be a dashing space lesbian or a space lesbian in distress? That's not po~warm.

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Hien released another volume by the way.

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On the note of Mouretsu Pirates I finally started watching the movie that's been on my backlog forever.
I can see a cute romance starting here.

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Cutest depiction of hacking I've ever seen.

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Grunhilde best princess.

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Guess this thread is so dead I'll just continue posting until the movie is over.

>>135662767
No, special relativity ignores *gravity*. General relativity is only needed when working in non-flat (non Minkowski) spacetimes.

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I'll never get enough of those delicious ship designs.

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>>135672600
My twin in taste. Also thanks for reminding me I still have the movie to watch.
Houkago no Pleiades The Movie: VACUUM OF MANIFOLD never ;_;

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>>135675245
Only downside of the princesses is that their default hairstyle is the worst possible one.
Man, a Pleiades movie would be nice, but the story is already over, sadly. All it would be was a recap of the tv show or an alternate version, but nothing completely new.

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>you'll never be a cute princess playing space pirate
Why even bother living?

>>135662543
I would note that being "magically transported" faster than the speed of light does exactly open the way for violations of causality, like meeting your past self. Saying the blue line is "in an alternate universe" is not only a cop-out, it's demonstrably wrong. As long as a light cone exists between the two places, they are within the same universe, and thus events there can affect each other after a sufficient lapse in time.

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>>135675509
I'm sure they'd come up with some nonsense if funding a movie was commercially sound. The only scenario I can think of that wouldn't shit on the series is letting the plot go and focusing on Minato getting better and Subaru making friends anew with everyone. But it'd be hard to make anything mahou shoujo and space related without hamfisting it.
Not that it matters now, but it's nice to dream.

Also it's not my favorite hairtstyle, but I think it works for her.

>>135662767
"Special relativity, contrary to some outdated descriptions, is capable of handling accelerated frames of reference."
The trick is to use Rindler coordinates to describe the acceleration, but without an acceleration profile it's tough to say what the elapsed coordinate time will be.

I could assume a classical trapezoidal velocity profile with a max acceleration of 1g, but that would be just that: an assumption.

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For reference: the chart in the OP is the upper right quadrant of this chart here.

>>135662631
Well, the earth would have (at a Lorentz factor of about 70.7). What the rest of the universe is doing is both unknown and irrelevant.

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It's all relative

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>>135677327

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>>135678080
Yes. In fact, I cringed a little that the OP image used phrases like "resting in space". What it SHOULD have said is that it's at rest *relative to the Earth* (which is being used to define the map frame in the diagram).

I desire to be Subaru and kiss Minato passionately on the lips.

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>>135677327
Ah, it all makes sense now.

>>135662543
What anime should I watch if my area is ferrofluids?

>>135678080
All but the speed of light, you mean.

>>135678118
It's a Minkowski diagram, which shows how the passage of spacetime changes depending on one's velocity. The hyperbolic angle between the t and the t' axis, and the hyperbolic angle between the x' and the x axis is the hyperbolic arctangent of the velocity as a fraction of the speed of light.

If Subaru and Minato had sex after their space kiss, could Subaru still be pregnant back on earth?

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>>135677327

>/a/ has quantum physicists here

>>135680120
Heck, my field is in electronics. I just happen to know some SR because I also like science fiction.
>>135680280
Whereas Subaru and Minato are objects/observers, sex/a kiss is an *event*. An event which involves two objects, like a collision, must necessarily take place in the same reference frame (relative velocity = 0). A looser, but equivalent, constraint is to require the two objects be within each others' light cones (though we all know sperm don't travel at the speed of light). Either way, any event in Subaru's future (seperated by a positive proper time interval) is causally connected to whatever she did with Minato.

>>135680633
Relativity has nothing to do with quantum mechanics though. Mainly because one of these works mainly with hadrons and leptons.

>>135673916
>implying you can apply lorentz transformations to an uniformly accelerated reference frame

>>135680633
But that isn't quantum.

Literally how autistic OP?

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>>135680782
>hardons

>>135680910
See >>135676753

>>135681094
>dyslexia

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In case you were wondering what those gears on their vroomsticks were.

>>135678197
Yes, the OP's image's use of terms invites the OP's misunderstanding.

>>135680677
And on that note, stay exact. An event is a well defined, infinitesimal, point in space time. When considering realistic situations we may either consider events of finite size in spacetime, or separate cause (kisiing) and effect (being kissed) into two events, with associated tensors and an event horizon.

>>135681094
'Physics gives me a hadron'

Saw that on the annual physics hoodie at a uni some years ago.

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>>135681094
I'd get such a hadron if a cute girl like Itsuki lept on me, pushed me down and pushed her bare boson into my face.
Sitting in top of me, my hands caressing gently her bottom, she would move her hips up and down, with a strange aroused smile in her charming face.

>>135681213
Well, composite objects follow world braids rather than world lines, but on the scale we're talking about, any of the characters and their vessels can be treated as singular particles. Therefore, the kiss, even though it takes place over a non-infintesimal volume and a non-infintesimal duration, can still be treated as a single event.

Also, in the case of flat spacetime, the tensor treatment of spacetime is really superfluous. As long as we can agree on a map frame to use (an observer that is privileged by us choosing it), four-vectors are sufficent to describe the problem in question.

So can somebody who is WRX's equivalent in this show? Must be best girl I bet.

>>135681336
Should've spoiled the flavors

>>135681259
Something like this?
http://io9.gizmodo.com/5049330/lhc-themed-t-shirts-commemorate-the-non-destruction-of-earth

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>>135681599
Would have been too obvious.

>>135681580
>somebody tell me
Fuck me. I'm half asleep typing this shit.

>>135680677
>my field is in electronics
Superconductivity?

>>135662932
This anon gets it.

>>135672600
Her space char uniform is still the best.

>>135681422
An event is not an interaction, it defines the state at a point on the manifold, so long as both parties are distinguishable, non-degenerate particles we xan't consider their mutual action an event. Also, it's not so much that composite objects follow world braids, but that the braiding of world lines defines interactions, and simultaneity.

And 4vectors are tensors, but I know what you mean.

>>135675509
Why is a hair down Grunhild so cute.

>>135676753
Doesn't matter, as Nanako has slowed down to a stop when she sent the message. No need to apply acceleration to the equation.

>>135680677
>we all know sperm don't travel at the speed of light

You challenging me mister?

>>135663657
>>135663855
Picked up.

>>135681965

Sorry anon, the best sperm can do is .99c

>>135682064
>his cum isn't FTL

How else do you expect your cum to reach you waifu?

>>135682192
Tell me your secrets anon.

>>135682212
Just believe in your dreams anon.

>>135662543
>Since Nanako only experiences 9 hours wouldn't Subaru's group recieve her call a split-second after she left?
Relatively yes.

If you've ever seen the movie Interstellar, there is a part where the astronauts are orbiting a planet that is experiencing an immense gravitational pull from a near by black hole. The astronauts summized that the time dilation experienced would cause their voyage to take far too long if the ship got too close to this gravity well. They decided to leave the space ship in a very high orbit so that it did not receive the full brunt of any time dilation on the planet while the other astronauts went to the surface.

In this scene the astronauts spent as little as a few minutes on the surface of the planet, little did they know they'd spent relatively 27 years compared to the space ship. The astronaut's rescue mission to the surface to rescue a previous astronaut who landed there 30 years ago, relatively had only spent about 10 minutes on the planet before dying.

Relatively is weird but know that the faster you go, the faster time goes relative to you.

>>135682242
Are you for real or just baiting?

>>135682192
>>135682064
>>135681965
/a/. Physics, acceleration modification for relativity calculations, plot line diagrams, and how to make cum travel at FTL.

You don't need the other boards anymore.

I love you all Pleiades anon

>>135682293
Relatively, the closer the quotient of the speed of light subtracted by your speed means as you approach a quotient of zero, the quicker you go, relative to people looking at you, your time frame is much slower

>>135682357
Pro tip: Just adding "relatively" to your argument doesn't make them correct.

>>135682398
>I don't understand general relativity but I'll call someone else who does understand it an idiot

You know the LHC in europe? the reason they made that mistake in 2014 where a particle had exceeded the speed of light. The physicists had forgotten to take into account Time Dilation on the satellite that was calculating the speed as the particle raced around the collider. Time is mildly slower on the satellite so when the satellite calculated the velocity of the particle, it neglected to account for the relative chance due to time dilation and effectively recorded the particle going faster than it really was because the clock on the satellite was slow

>>135682192
What are the implications for cums traveling at .99c? Will it still be viable when it crosses into mars?

>>135682480
You won't need to buy cumrags anymore, that's a plus.

>>135682480
/tg/ please stay and stay here.

>>135682477
That has nothing to do with general relativity, though. And do you seriously expect me to believe that someone who doesn't know what the Lorentz Factor is knows anything about physics?

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>>135682477
I thought it was because they left a cable unplugged.

>>135682480
Since every reaction has an equal and opposite reaction, a glob of semen, lets just assume it was 1 gram because math is easy.

1g of cum traveling 99% the speed of light puts the semen at a velocity of 299,792,458m/s * 0.99 which is 296,794,533.42m/s barely a scratch in the overall speed

since Kinetic energy = 1/2mv^2 thats KE= .5(1g)(296794533.42^2)

This means the 1g glob of cum has a Kinetic Energy of 4.40434975339977484482 × 10^16 mJ or 4.40434975339977484482 × 10^13 Joules

Converting the sudden motion of this glob from joules to Nm of force gets you about 4.404349753x10^15 Newtons

How much that force is relatively I'd assume be something like getting hit by one of the US's Supercarriers going like mach 8

>>135682723
http://www.wolframalpha.com/input/?i=kinetic+energy&a=*C.kinetic+energy-_*Formula.dflt-&a=*FS-_**KineticEnergy.K-.*KineticEnergy.m-.*KineticEnergy.v--&f3=.001+kg&f=KineticEnergy.m_.001+kg&f4=296794533.42&f=KineticEnergy.v_296794533.42

According to this, you'd produce 12,234 Megawatts

http://www.wolframalpha.com/input/?i=12234+megawatt

12234 Megawatts is about the force generated by the space shuttle taking off

>>135682871
>shooting a space shuttle out of your dick and into orbit

>>135682723
>since Kinetic energy = 1/2mv^2 thats KE= .5(1g)(296794533.42^2)
Not a specialist, but wouldn't you have to apply corrections since it's going too fast?

>>135682902
For reference, on >>135682521
you would just be able to shoot it into orbit and never have to worry about

>some years later it hits some space engineer in the face, a big glob of frozen cum that'd been orbitting earth for tens of years.

>>135683008
I don't know, I was treating it as a singular object, I don't know what implications that'd be for correcting for shit like "going so fucking fast no one can see you"

>>135682723
>4.40434975339977484482 × 10^13 Joules

http://www.wolframalpha.com/input/?i=4.40434975339977484482+%C3%97+10^13+Joules+to+Newton+Meters

>70% the yield of the Little Boy Nuclear Bomb
>shooting an atom bomb out your dick

>>135682871
>12234 Megawatts is about the force generated by the space shuttle taking off
Actually, it's 12234 MWh (since we are measuring energy here, and Watt = energy per time).
It's actually 0.7x the energy wield of Little Boy.

>>135683111
dank

>>135682723
You're forgetting special relativity, again.

Because mass increases with velocity, you need to use the relativistic formula, which is E_k = mc^2(γ-1), which is 6.24 * 10^15 joules

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>>135683151
>6.24x10^15J w/ special relativity
So about 50% more than my previous estimate

lets plug that into wolfram alpha

>http://www.wolframalpha.com/input/?i=6.24x10^15+Joules+to+Newton+Meters

>62% the force required to make a crater in Arizona thats 2.6 miles wide and 550 feet deep

>>135683246
>50% more
Actually, it's about 154 times more.

>>135683320
forgot my number was like 4.4x10^13 and not ^15

>>135683246
What if One Punch Man's secret attack was shooting semen at 99% the speed of light.

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>>135683364

>>135683099
Perfect.

I love you /a/ by the way.

>>135683246
Don't forget the other effects of launching a projectile moving that fast through an atmosphere:
https://what-if.xkcd.com/1/

>derp commander not shitposting but talking about interesting stuff
You're off my filter.

>>135682723
How far out of its synchronous orbit will cumming at 0.99 c move the earth?

/a/ - cum physics

>>135683980
We need to screen cap this and archive it for all eternity.

Also cumming so hard it creates a wave of plasmerized air around it.

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>>135683940
Since the mass is only a gram, even at 0.99c it would only impart 2.278×10^-18 times the Earth's orbital kinetic energy, which wouldn't measurably change any of the planet's orbital parameters.

>>135684207
So it is mostly safe then.

>>135684241
Unless you are in the vicinity of the release.

>>135673916
sr ignores non inertial reference frames

>>135676249
But in a universe where the constant c is different than em propagation speed, your light cone becomes c cone, and argument falls apart. Even in our universe, c may be slightly different than photon prop speed, look up the theories

>>135684426
>c may be slightly different than photon prop speed, look up the theories

Why do you rip apart everything I know about the world?

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>>135684319
For the third time, no. Rindler coordinates allow you to explain and understand constant acceleration using SR alone.
>>135684426
So far every experiment shows that EM radiation propagates at c. If there is any difference, it would be so minuscule as to have no practical application.

I always knew I would find a use for my physics degree. Now we just need to find a way to make your cum travel at 0.99c so we can cum on the sun and other planets.
Actually, this might be all wrong, since semen was considered as a solid, whereas it's a fluid, but oh well.

>>135684673
What are the probability of the semen entering the correct receptacle? Impregnating a planet is hard work.

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This show was amazing. And most likely we'll never have anything like it again.

>>135684751
We don't need to.
I enjoyed this. Now I want something else.

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>>135684673
Any fluid parcel moving that fast will tend to behave as if it were a solid object from the perspective of everything else.

>>135685040
What is the gif? Model of fluid moving within a solid object?

>>135685406
No, it's actually a demonstration of chemical diffusion through a solid. Not terribly related, but it was a picture I had on me.

>>135685447
Fluid diffusing through a solid? What witchery is this?

>>135685500
A gas, actually. It's from a report I did on the reaction of silicon with oxygen at high temperatures. Not terribly interesting, but it is related to how corrosion works.

>>135684751

anyone have the rest of these images in higher quality? just realized mine are all shit

>>135685778
Try asking >>>/wsr/

>>135662631
If anyone goes at the speed of light, then from that person's frame of reference, the universe will have suffered heat death within the first nanoseconds of departure...

Is 99.99% the right amount of 9s? It really does make a big difference.

>>135686534
Nothing except light itself can move at the speed of light, first of all. Second of all, no, from the light's perspective, all causally-connected events occur in the order in which the light reaches them.

As for the second question, 99.99% was the figure everyone went with. There's nothing special about it per se. Any object can go any arbitrary speed that is at all less than c.

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>>135684722
It's impossible to say without knowing the angular standard deviation of the, ahem, launcher.

>>135681209
This is the transmission?

>>135688015
No, that looks like a gearbox of some sort. The transmission is a whole system of which the gearbox is only one small part.

>>135688706
Well, I learned something new.

A transmission is a machine that consists of a power source and a power transmission system, which provides controlled application of the power. Often the term transmission refers simply to the gearbox that uses gears and gear trains to provide speed and torque conversions from a rotating power source to another device.[1][2]
In British English, the term transmission refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive), differential, and final drive shafts. In American English, however, the term refers more specifically to the gearbox alone, and the usage details are different.

>>135689187
People in the field of mechanical engineering tend to use the British definitions because it fits in better with the terminology for all the other kinds of machinery.

What the fuck is going on in this thread

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>>135691130
This, obviously

>>135686534
99.99915%, by my calculation

>>135691388
Physics of cum.

>>135692183
And Rindler coordinates. Don't forget Rindler coordinates!

>derp_commander can discuss shit for fun without shitposting
>instead chooses to tripfag and shitpost regularly.
You can change this.

>>135692522
This is like the only good thread on /a/ right now, everywhere else deserved to be shitposted.

>>135692522
By not answering or mentionining him

>>135662543
>99.99% of c
>β=0.9999
>γ=70.7
wew so slow

>t. working at sern

>>135693033
It is an honest mistake. Anon just mixed up where to put his variables in a high school level physics equation.

>>135693033
>sern
Too much science I guess,

While we wait, good physics anons, explain more astrophysics to me.

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>>135685778
Not sure how high quality you want, but I got a few

If I bought two identical watches, wore one on my wrist, tied one to a piece of string, and swung it around all day every day as fast as I could. How long until they become slightly out of sync?

>>135693264
I was the anon wondering about decorating my room in a similar style. Still haven't finished but I have good hopes for it.

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>>135693264

>>135693279
Does circular acceleration count? I guess it does as it is speed in one direction without acceleration.

>>135693279
Probably a few billion years

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>>135693340

>>135693312
Such a great room design. Once I graduate and have money, I plan on setting up a wall like that.
Got a telescope for christmas, plan on using it once shitty Midwest weather moves on.

>>135693462
Still need some space shots that looks like that.

Then I will go to a print shop to print them out. If you have some please do share good anons.

Anyone got the yuri physics copy pasta?

>>135693279
Youre watches will always have too large of error and noise to precisely correct so you will never witness the effect from relativity.

t. Experimentalist who think theorists gone too far.

>>135693507

NASA images have some quality shit I believe, mostly high res and they share stuff daily. I see it on Twitter and Flickr often.

>>135693551
Radiodecay clocks are based anon.

>>135693579
Thanks anon, will hunt for them.

>>135693166
>good physics anon
I am afraid but such anon doesn't exist. You can read and try to understand this while waiting tho.
https://en.wikipedia.org/wiki/Superluminal_motion

>>135693662
My mind is full of little fucks now.

>>135693579
Space pics, while amazing, have this fuzzy look to them, unfortunately.

>>135693279
However long it takes for the watch to slam into the ground when you lose your grip or the string breaks.

Reminder that the "planck length" is just the size of a 4th dimensional pixels and we are living in a simulation while 4d otaku are making us their waifu.

>>135693778
Get some ultra high res ones, throw an artistic filter in Photoshop on it so it looks hand painted, take it to a print shop. That way you can pretend your a rich fuck who bought hand-painted starfields

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Will downscaling the image improve how it looks printed, I wonder?

>>135693859
Amazing idea. Will try this out.

Thanks good anon!

>>135693871
I was wondering too. If we print that as a standard A7 sheet it should look like the preview of it right?

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>>135693871
PIA13112 is amazing, by the way.

>>135693871
I think it's the colors used. IIRC, they usually combine the images with a bunch of different parts of the EM spectrum to get a picture like that with all the vibrant colors.

>>135694032
>>135693934

is space this colorful if I go up there?

So to measure distance in space, we have to parasecs now, since light years is too short a distance?

And I will never get to touch these systems we see in the sky?

>>135694075
I hope you have EM eyes anon.

>>135694075
Only when you can also see radio waves, Infrared, UV and double plus good for X-ray also

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>>135694122

ah, well. I won't be able to go up there anytime soon anyway.

>>135693662
Is this real?

So everything was a lie?

>>135694097
>And I will never get to touch these systems we see in the sky?
No. Anything you can see in the sky is way too hot for you to touch anyway.

>>135694166

Is that Harry Potter?

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>>135693859
>>135693871
w/ baseline watercolor filter

>>135694234
It is good, but not what I had imagined. Will try some other filters too.

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>>135694097
Parsecs are just a unit more convienent to astronomy because they can be determined directly from telescope images.

As for the second question, it's unlikely that we'll have any kind of interstellar travel in our lifetimes. If we do, it's likely to be in the form of multi-decade subluminal missions, probably involving probes first. The engineering that could in theory allow us to break the light barrier (yes it exists, and I will explain it if anyone asks) would probably require at least a 50-year commitment to an immense multinational project, and that's just once it begins.

Predicting the future is hard. I could be pleasantly surprised, but I wouldn't bet any money on it.

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>>135694230

it is.

>>135694234

i think it will look better if it is printed on a paper with smaller dimensions, with proper scaling.

>>135694278
>yes it exists, and I will explain it if anyone asks

Don't dangle it in front of us. Tell us.

>>135694278

So I suppose I should begin saving up money for cryogenics and freeze my ass for dat sweet, somewhat unlikely future.

>>135694348
>Wake me up when you go go to Alpha Centauri.

>>135694249
>>135694288
I just kept applying one until it looked pretty decent. I think it would look better if it was a smaller portion of the sky so you see more of the strokes and, yeah, proper scaling. Definitely something to play around with though.

>>135694278
I think there are a few of us who would even sign up to live on a generational ship to be the pioneers.

We are able to accelerate particles to near c?

Why did not one tell us?

>>135694387
Interview to get on the ship
>"So Anon, what are your skills?"
>"I can sit still for long periods of time."

>>135662543
HAI! WAKARIMASEN!

It sounds cool and all, but give it some thought, what exactly are you even going to do at Alpha Centauri? What do you expect to happen? It's just a bigger Sun.

>>135694447
Join Miriam in the fight against Yang of course.

Truthfully it will be a hard journey full of difficulties. But like the kingdom of heaven or the exploration of the new worlds, it holds so much promise that some of us have to go.

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>>135694447
Not just a bigger Sun, nigga it's got 3.

Is Gainax completely dead now?
Have they announced anything in the works?

>>135694512
Praising the sun harder.

How can a planet be livable under these conditions though? Won't anyone on planet surface get bombarded with EM radiation?

>>135694520
While Pleiades was airing they supposedly had 2 projects in the works.
http://myanimelist.net/anime/32067/Akubi_o_Suru_ni_wa_Wake_ga_Aru
and
http://myanimelist.net/anime/20471/Aoki_Uru
But nothing since then.

>>135694097
A parsec is only 3.26ly. So it's still in ly's order of magnitude.

A real direct measurement with the definition of parsec can't really be used when object is over 1000 parsec. That's why we get huge amount of uncertainty in the distance of outer galaxy objects.
I recommend this article.
https://en.wikipedia.org/wiki/Cosmic_distance_ladder

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>>135694299
Ok, well...

There is the HIGHLY speculative Alcubierrie drive that was proposed around 1994. NASA is currently doing some introductory experiments with it, but these have so far come up inconclusive.

The AD basically mucks around with the shape of spacetime to create a kind of bubble which can carry an object sitting in a locally inertial frame. This requires a tremendous amount of energy, including some weird negative energy that may or may not presently exist.

Any vessel capable of containing such a drive would probably have to be quite large, on the order of the size of an aircraft carrier at least. That means it would probably have to built in pieces in orbit. If you look at how long it's taken to assemble the still-unfinished ISS, you start to appreciate how *massive* an undertaking this is.

Unless the development of aerospace technology accelerates *tremendously* in the next few decades, the construction of a "warp"-capable vessel could easily be at least a century off.

>>135694654
Thanks anon!

>>135694654
Using thermonuclear flashes on the surface of a neutron star as the standard to calibrate your candle to determine how bright a star is so that you can measure distance.

Why is astronomy so convoluted but so awesome at the same time?

>>135694684
Oh that. I thought it went no where?

I believe we may see the advent of permanently inhabited space stations before we die. We will die knowing there is a chance we can reach out to the stars, but we are lucky enough to die before seeing the hardship and the empty promises, so we will die hopeful for the future.

>>135694654
>Extra-galactic measures

Can we even detect things from that far away?

So physics anons, help me. If we are still seeing the EM radiation from the big bang, does that mean it somehow traveled slower than our planet to get here?

>>135695024
Because the big bang and the universe's expansion is about physical distance expanding, so one kilometer yesterday is longer today than yesterday if there was an objective way to measure it.

But what does this mean in terms of light fuckery? Since light always travel at the same speed?

Wait event horizon is at the edge of the world we can see with EM radiation? Not approaching a black hole?

Hang on can I really apply my gr background to this show? If so it's picked the fuck up.

>>135695175
General Relativity?

Welcome aboard. Anons all learned about the relativity again with this show.

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>>135695024
No. The CMB isn't like a single flash. It's more a diffuse glow. What /is/ interesting is the fact that the universe appears to be larger than our light horizon, combined with its apparent uniformity, which under the current theory of cosmology suggests some kind of cosmic inflation that blew apart the nascent universe at superluminal speeds (note this is also some of what gives me me hope for the AD: the fact that spacetime itself has no speed limit).
>>135694776
Well, what could possibly be more complicated than the whole universe? And what could possibly be more awesome than stuff blowing up on a massive scale?

>>135695024
>If we are still seeing the EM radiation from the big bang
We aren't. CMB is from after that. We can't see past the reionization era precisely because it's opaque. The light we see from it has traveled an apparently impossible distance given the age of the universe. This is due to the expansion of space on such a scale.
Fun fact-the CMB is slightly redshifted on one side and blue on the other.

>>135695145
Please think about what horizon means.

>>135695294
>>135695249
My mind is full of fuck. I got to sleep, but if this is still alive tomorrow I love to chat with anons some more. I am finally starting to understand the beginning of cosmology.

>>135694545
They're pretty far apart, and if I remember right, Proxima is dim as shit even as a red dwarf. A planet can easily find a habitable orbit.

>>135695145
Want to know even more fuckery?

If the universe is expanding the light horizon is shrinking every second. So something that would be visible today will be invisible tomorrow, beyond the horizon. Eventually we may move too far away to see the closest star.

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>>135694545
No idea actually. We don't know if there are any habitable planets in the system anyways. IIRC Beta Centauri isn't as bright as Alpha, emitting more x-rays comparatively. And Proxima is a dense red dwarf and too dim and small to make much of a difference anyways, it's about a quarter of a light year from Alpha Centauri.

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>>135695336
If it's not, feel free to come over to >>>/sci/ in the morning and ask any remaining questions you may have.

>>135694837
It hasn't gone nowhere, it just relies on assumptions that have yet to be proven true, and there are some alarming consequences when actually modelled like massive amounts of gamma radiation.

Last I heard NASA had produced warp field interferometer results from the EM drive, but that's no surprise since everything about the EM drive is anomalous.

>>135695562
don't do it it's a trap

>>135695562
Thanks good physics anon.

>>135695543
>>135695515
I pity my distant descendants who will be hunting for a habitable planet.

So the universe is flat?

The flat earth people are right all along?

>>135695573
/Sci/ can't be that bad right?

>>135695568
Ahhh thanks good tripanon.

Last questi

>>135695093
The speed of light is local. As space expands, the wavelength is stretched out and you get redshift. It's very similar to the Doppler effect.

>>135683151
>You're forgetting special relativity, again.
People always do.

>>135695643
The universe is so goddamn close to flat that we can't tell which way it's bent (hyperbolic or spherical).

>>135695704
Last question before I have to go to bed too.

Does gravity travel at c? Or is it just gravity waves?

If gravity travels at c, does that mean photon, which has mass and should be affected by gravity, can outrun gravity and therefore not be affected by it?

>>135695719
That is neat. Thanks anon.

>>135683797
>Don't forget the other effects of launching a projectile moving that fast through an atmosphere:

"It was quite small for what it could do -- small enough to fit into an average-sized living room -- but it was moving at 92 percent of light speed when it touched Earth's atmosphere. A spear point of light appeared, so intense that the air below snapped away from it, creating a low-density tunnel through which the object descended. The walls of the tunnel were a plasma boundary layer, six and a half kilometers wide and more than 160 deep -- the flaming spear that Virginia's eyes began to register -- with every square foot of its surface radiating a trillion watts, and still its destructive potential was but fractionally spent.

Thirty-three kilometers above the Indian Ocean, the point began to encounter too much air. It tunneled down only eight kilometers more, then stalled and detonated, less than two-thousandths of a second after crossing the orbits of Earth's nearest artificial satellites.

Virginia was more than three hundred kilometers away when the light burst toward her. Every nerve ending in her body began to record a strange, prickling sensation -- the sheer pressure of photons trying to push her backward. No shadows were cast anywhere in the tower, so bright was the glare. It pierced walls, ceramic beams, notepads, and people -- four hundred thousand people. The maglev terminal connecting Sri Lanka Tower to London and Sydney, the waste treatment centers that sustained the lakes and farms, all the shops, theaters, and apartments liquefied instantly. The structure began to slip and crash like a giant waterfall, but gravity could not yank it down fast enough. The Tower became vapor before it could fall half a meter. At the vanished city's feet, the trees of the forest were no longer able to cast shadows; they had themselves become long shadows of carbonized dust on the ground."

>>135695846
In Kandy and Columbo, where sidewalks steamed, the relativistic onslaught was unfinished. The electromagnetic pulse alone killed every living thing as far away as Bombay and the Maldives. All of India south of the Godavari River became an instant microwave oven. Nearer the epicenter, Demon Rock glowed with a fierce red heat, then fractured down its center, as if to herald the second coming of the tyrant it memorialized. The air blast followed, surging out of the Indian Ocean -- faster than sound -- flattening whatever still stood. As it slashed north through Jaffna and Madurai, the wave front was met and overpowered by shocks rushing out from strikes in central and southern India.

Across the face of the planet, without warning, thousands of flaming swords pierced the sky...

Then out of no where -- out of the deep impersonal nowhere -- came a bombardment that even the science fiction writers had failed to entertain.

Just nine days short of America's tricentennial celebrations, every inhabited planetary surface in the solar system had been wiped clean by relativistic bombs. Research centers on Mars, Europa, and Ganymede were silent; even tiny Phobos and Moo-kau were silent. Port Chaffee was silent. New York, Colombo, Wellington, the Mercury Power Project and the Asimov Array. Silent. Silent. Silent.

A Valkyrie rocket's transmission of Mercury's surface had revealed thousands of saucer-shaped depressions where only hours before had existed a planet-spanning carpet of solar panels. The transmission had lasted only a few seconds -- just long enough for Isak to realize there would be no more of the self-replicating robots that had built the array of panels and accelerators, just long enough for him to understand that humanity no longer possessed a fuel source for its antimatter rockets -- and then the transmission had ceased abruptly as the Valkyrie disappeared in a silent white glare.

>>135695846
Can a light be so intense it does not cast a shadow?

>>135695889
Sauce my good anon.

>>135695846
The Killing Star?

>>135695902
>Can a light be so intense it does not cast a shadow?

Kinda. We generally don't think of 'light' being anything above or below the frequencies we can see in, but their is only a difference in energy between the color blue, radio waves and gamma rays. A relativistic mass that is suddenly converted into energy due to a deceleration is going to put out EM on every wavelength and a whole fuck ton of it.

I think that at a point with enough 'light' you will melt anything that absorbs at it's wavelengths, so with just visible light you will still sorta cast shadows at least until back scatter puts light into the dark areas.

>>135696002
>The Killing Star?
Yep but taken from reference of: http://www.projectrho.com/public_html/rocket/spacegunexotic.php

>>135696053
And actually in another second of thinking, if you have soft gamma rays just above the UVC range they will slow and emit lower energy photons as they bleed off energy. Technically any source of x or gamma rays will be able to light up the shadows due to the chain of energy releases, pair production and annihilation that happens.

But even can't get near it even with someone you don't like crazy powerful EM radiation sources don't actually put out much power. A 12W iridium source that will out right kill you if you picked it up and looked at it for about 30s is still only 12 watts.

The example from above is much larger. Much larger.

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I hate pleiades' threads because they make me feel dumb.

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>>135695807
Gravity waves travel at c.

Gravity itself is the curvature of spacetime. You can no more outrun it then you can the ground beneath your feet.

Also, no, the photon does not have mass. That's why it also travels at c.

>>135696231
Yeah, I used to be really into this stuff when I was a kid, but somewhere along the way it got too advanced and I just cannot catch up now. Every time I try to wrap my head around any of it, it doesn't make sense now.
Animu turned me dumb

>>135696320

If you build a strong foundation, you'll catch up, Anon

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Any other sci-fi/space anime you guys want to talk about, while we're at it?

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>>135697119
How did they throw galaxies at each other in TTGL? Is it possible to throw a planet into someone like in Diebuster. How did pic related happen and also on a scale of 1-10 how literally fucking based was Diebuster?

>>135694684
What is funny though, is if you have faster than light travel, in any way or form, you also have time travel. Not necessarily causality violation. A portal network can exist with the right topology to disallow causality violation, though it is an interesting exercise. But time travel, surely.

And the way FTL is presented in any way and form in SF allows both time travel and causality violation.

>>135697326

even my meager understanding of astrophysics tells me this is all fucking bullshit and you'd fuck up the whole galaxy if you chuck a planet at someone

>>135697552
>you'd fuck up the whole galaxy if you chuck a planet at someone

Nah, you would fuck up the orbits in the solar system at worst.

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>>135697552
I want to see the smartcunt explain it.

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>>135697691
>Wanting to explain perfection.

There are more things in heaven and earth, anon, than are dreamt of in your philosophy.

2016 Impreza, WRX, or Legacy?