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What sort of technology do you need to build...
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What sort of technology do you need to build an FTL drive/ship, and not have to spend eons on a trip getting anywhere close to Earth?
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Balloons
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>>45664785
Aeons* Sorry for the retarded spelling.
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According to theory of relativity it is impossible to travel faster than the speed of light. I'm not an expert in this subject though, /sci/ might know better.
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>>45664785
something no one's found out about, now go back to playing your scifi games.
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>>45664812
The theory of relativity also says that you can travel between galaxies in seconds.
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Well, one possibility of FTL travel would be using wormholes or other spacetime anomalies. But before we can even do that, we need an energy source that can produce ridiculous amounts of energy. Current candidates are nuclear and antimatter.
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>>45664829
How?
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>>45664842
>Current candidates are nuclear and antimatter.
Not even those would be enough.
Also, exotic matter.
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>>45664842
To even stop a wormhole from closing itself because of supergravity you'd need exotic matter which has negative mass and is a purely theoretical thing that nobody has ever seen or detected in any way. These are mostly theories, none of them are possible to implement, just like time travel theories.
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>>45664849
What is time dilation
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>>45664927
If this was enough, we'd be already using it.
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>>45664866
>>45664877
I didn't include exotic matter because it is still theoretical. Exotic matter is more or less just a category of matter that physicists use to make their theoretical models work.
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>>45664942
>what is time dilation
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bussard ramjet
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>>45664785
INSUFFICIENT DATA FOR MEANINGFUL ANSWER

Joking aside, unless you can figure out a way to tell Einstein to go fuck himself, there is no good way to travel around just our own system without needing to spend 30+ years to do it.

Just going to the neareat star would take about 2,000 generations of humans. (if you traveled around 50,000 Mph.)


This thread is bad and you should feel bad
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>>45664973
OP going back in time and fucking his grandmother
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>What sort of technology do you need to build an FTL drive
Space magic.

>>45664973
That only works locally, you'd still arrive millions of years after you left.
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>>45664998
See >>45664973
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>>45664942
Yes.

Seconds for the TRAVELER
meanwhile, 2.5 million years has passes on earth.
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>>45665017
The people on a trip would not spend eons, QED
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Just imagine niggers in space. Or Muslims in space. Thankfully FTL travel is impossible
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>>45664998
There shall be light!
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>>45665022
You arent getting it.

Time dilation only works for the traveler.

If you traveled 3 billion ly to look at and verify a planet can harbor human life, when you returned to tell everyone to pack up, earth would be dead and likely vaporized by our now red giant sun.

Stop being a faggot.
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>>45664973
It is that process that doubles your cosmic radiation exposure with every traveling time halving.
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>>45664998
>Mph
jij
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>>45665070
Read OP's question you retard.
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How do we know that time dilation is real and not just some measurement device misbehaving? Maybe clocks in motion just work a little bit different than stationary ones?
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for all the noobs:

1 - time dilation only becomes an issues at 0.7c
2 - nuclear explosions caused by impacting space dust becomes an issues at about 0.2c

so, realistically, dont expect to go past 0.15c

also, just hibernate for the long journies, its not that big of a deal, and so what if everyone you know is dead when you return to earth, theyre all dicks anyway
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>>45665126
>Maybe clocks in motion just work a little bit different
They do. It's called time dilation.
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>>45665126
Because it is proven through mathematics.
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>wanting to explore a vast, vast nearly empty universe just so Uncle Sam can build a Walmart on the moon
Humanity should stay on earth
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>>45665058
That's a pretty cool concept. Is it even theoretically possible though?
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>>45664849
There are solutions to Einstein's field equations that allow FTL travel. Some Mexican scientist figured it out quite recently.
His solution required an entire galaxy worth of mass converted directly into energy, which was essentially impossible. However, since then the solution has been optimised some what to the point where you only need 1 metric ton of mass converted to energy.
The maths is probably beyond anyone on 4chan, but it does exist.
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>>45665134
add a windshield :^)
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>>45665138
How do we know our mathematical model of physical phenomena is 100% correct? Maybe there's some epsilon error somewhere?
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Warp drive. NASA is currently doing small scale lab experiments to determine if we can bend spacetime at all other than with a gravity well with current or near-future technology.
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>>45665140
We need to escape this rock relatively soon, else we'll all be toasing in an epic planet.
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>>45665141

Yes.
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>>45665144
http://en.wikipedia.org/wiki/Alcubierre_drive for those interested
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>>45665059
I had a dream of that very story.
When i woke i began searching for information related to it.

Boy was i shocked when i came across that short and literally, word for word my dream lined up with it.
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>>45665149
Because truth can only lead to truth through equivalences and logical linking. If you start with true axioms, you can only end up with true statements.

>what if our axioms are wrong
They are, it's called improving science.
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>not just sucking it up and accepting the fact that interstellar travel takes decades in hibernation
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>>45665141
see >>45665161
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>>45665147
that might work if the windshield wasnt made out of matter
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Space Engineers, an Oculus Rift, and a very good CPU
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>>45665156
Why bother? The same shit on earth will occur elsewhere: overpopulation, pollution, war etc etc. Why do we need Muslims in space?
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>>45665126
GPS satellites have to be configured for time dilation.
It literally exists.
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>>45665167
Yes, but that's only when we talk about pure mathematics, when we apply math to model physics, it's always some approximation, it is entirely possible to apply mathematical model to physics in a wrong way and then even though math says something is true, it isn't in the real world.
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>>45665201
This doesn't at all disprove the hypothesis that it's a malfunction of clocks in space and not a real time difference.
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>>45665219
Fuck off anon god wants you on earth for a reason
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>what sort of technology do you need to build an FTL drive/ship
If we knew, we would build one.

I stopped going to /sci/ because I was tired of people always asking retarded questions like this. Please go back there and stay.
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>>45664785

FTL? Impossible via conventional propulsion methods. Universe says no.

Warp drive is theoretically possible. See the nasa drive above. I think you need something ridiculous like the entire output of the sun to power one though.

Fastest propulsion methods using currently available tech are nuclear explosion propelled craft. You drop nukes behind you and "ride the wave". For obvious reasons this is not a good idea. Project Orion is pictured.
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>>45665247
Chill, bro. I was just speculating.
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>>45665270
Lel
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>>45665256

Nuclear thermal rockets provide a high efficiency, but are not as efficient as ion engines. They are similar to conventional rockets, but first the fuel is passed through a nuclear fission reactor. The reactor heats the fuel before it is combusted, providing a higher exhaust speed. NASA's NERVA is pictured. These are fucking great and make getting to Mars much easier.
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This is why transhumanism is a more pressing issue than deep space travel. If we obtained immortality through genetic engineering, biomechanical augmentations, etc. then the long distances would become a non issue. You could wake people in cycles to maintain the ship while the others remain in stasis.
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>>45665138

How the fuck does one just sit on a desk one day and conclude how the universe works through fucking maths?
>tfw you're stupid
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>>45665302
You remember those Trigonometric Functions (Sin, tan and cos?) that is how, triangles.
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>>45665302

Because they're so smart it's retarded.
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>>45665295
I don't want transhumanism if it's going to be like modern technology, all nonfree, proprietary, filled with backdoors, logic bombs and security compromising bugs in source code.
>I never asked for this
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>>45665302
not one day, not the entire universe
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not possible, you can't warp spacetime like you can fudge numbers in an equation because the limits in reality are undefinable over time
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>>45665144
>His solution required a few hundred universes worth of exotic matter
>a type of matter which may or may not actually exist
>However, since then the solution has been optimised some what to the point where you only need a couple of hundred metric tonnes of exotic matter
ftfy
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>>45665302
It's not very complicated. Here is how it works.

Let's pretend you're some ancient greek dude. You notice the sun is small in the sky and always show up in the morning, disappears at sunset.

So you assume the sun is some sort of ball/god/chariot that rotates around the earth.

Despite being wrong, it's a valid model (ie : a way to simplify something complex in order to actually get shit done about it) and you can use it to draw conclusions (the sun will rise tomorrow).

TL;DR : we look at what happens, build models to represent and compute stuff about shit, models turn out wrong so we build better ones. Models work through mathematics so using one model implies a lot of stuff about everything.
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>>45665334
>you can't warp spacetime
Then how does gravity work?
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>>45665302
Moran
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>>45665290

Ion engines use a high voltage metal grid to accelerate plasma providing propulsion. Efficiencies are very high, but so is the demand for electrical power. Thrust is also very low. propelling a large enough power source out of the solar system would be a challenge.

Ion engines have been used on several small space probes. The ESA's GOCE used one to skim the upper atmosphere, allowing it to make sensitive measurements of the earth gravitational field for a long period. It also looked totally badass and was dubbed "The Ferrari of space".
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>>45665348
i never said you can't warp spacetime, i said you can't warp spacetime to the degree that our current models predict
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More decouplers.
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>>45665348
Duhh sceyeuhnce
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>>45665219
Take a look at the discovery of the Higgs Boson particle. The only reason we were able to find it was because of time dilation. No malfunctioning clocks here, just really fast subatomic particles who were finally able to live long enough to be measured thanks to time dilation.

Time dilation is, without a doubt, a real world phenomenon.
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you need element 115
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>>45665381
no it wasn't, it was because at a high enough energy level in a matter accelerator we eventually came across solid evidence of the decay pattern

wtf are you on
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What if God was one of us?
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>>45665134
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FTL travel is the same as traveling back in time. We have no evidence of any time travelers, and it's hard to believe nobody would want to travel to their past, so it is almost certainly impossible.
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>>45665381
I don't know how it was discovered, but it's interesting that time dilation was used in it.
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>>45665416

Sorry,
Thats 4ly traveled at .15c
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>>45665421
There would be laws and regulations, a lock that stopped you going back in time further then X-year, there would also be secret police, Time Traveling Gestapo to stop people from fucking up the continuum.
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>>45665270
aylemo
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>>45665256
It's theoretically possible if you flip the sign on the mass component. However negative mass does not exist. Coincidentally, if it did exist, it would spawn an infinite amount of negative mass and every point in the universe of diverge. That would be inconvenient.

FTL also has the trouble of being incompatible with special relativity and causality. FTL allows for time travel.
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>>45664849
Wormholes.
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>>45665421
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>>45665437
Or maybe society ends before it's discovered? Still plenty of time for the collapse of the only real (western) civilisation.
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>>45665421
>>45665437
I'll just write it before things go further
>inb4 John Titor, time travel search online experiment, Steins;Gate, mai waifu Back to the Future...

Please, let's concentrate on FTL
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>>45665456
what would stop a wormhole collapsing the second it popped into existence?
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>>45665456
You need exotic matter for this and there's no proof that it exists.
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>>45665338
>His solution required a hundred billion universes worth of mass of exotic matter
ftfy^2
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Tachyon bubble generator. Allows for near infinite 'speed' travel (orders of magnitude faster than light)

>>45664849
The Star Trek warp field drive works on a similar mechanic.
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>>45665460
Not him but it's not FTL.
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>>45665460
>possible without exotic materials
>low input power
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>>45665460

I thought Alcubierre drive needed exotic materials
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>>45665501
Do tachyons even exist or are they purely theoretical?
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>>45665475
Inverse tachyon field
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>>45665515
complete theoretical nonsense
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>>45665515
Not even theoretical. Only hypothetical.
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>>45665460
>Time Travel to Past: No

But that's wrong. Any FTL method can be used to travel back to the past or at least send a message back.
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>>45665528
>SUBLUMINAL

Holy shit, you guys truly are denser than gravitational singularities.
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>>45665528
you cannot go FTL, even if you consider that it can happen matter ceases to exist in the form that we've come to understand it and all rules go out the window
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>>45665460
http://exvacuo.free.fr/div/Sciences/Dossiers/Time/A%20E%20Everett%20-%20Warp%20drive%20and%20causality%20-%20prd950914.pdf
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>>45665528
Everyone knows only a high intensity baryon sweep from the main deflector can generate enough energy to move through the space time continuum, nerd
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>>45665460
>speed: subluminal
that's a fancy word for below light speed
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>>45665270
holy shit this picture is so funny, i can't stop laughing
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>>45665416

>someone actually made an app that calculates time dilation
>someone actually downloaded that app
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>>45665559
>you cannot go FTL
Next thing you'll be telling me that negative energy can't exist.
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>>45665421
>We have no evidence of any time travelers

string theory tends to clean that up
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>>45665577
or those messages that come in through commercials to buy things without the people actually saying it

>anti-matter, energy
anti matter is way or means to store energy, just like batteries don't make energy, they store energy.
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>>45665416
>>45665427
so a difference of 100 days? Id say that constitutes as not an issue
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>>45665605
The speed of light is not a limit to be broken. It is a conversion factor between dimensions in space and the dimension in time.

You can go very fast if you have very little mass, but you cannot exceed c because at c, transit time for you is already zero (all space no time).

If you think you can go FTL, it just means you failed the first quarter of Physics.
>>
Once you can operate energies needed to FTL there is no point in actually going anywhere because you can do every conceivable thing in your own neighbourhood

Also there's that small matter where going FTL actually breaks the universe

its kinda like dividing by zero
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>>45665134
>time dilation only becomes an issue at .7c
>time dilation is an issue for accurate GPS
Conclusion: GPS orbit earth at speeds greater than .7c
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This is the best thread that I could ever post this question.
How would it be possible to create an opposite flashlight? Like a flashlights that emits darkness
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>>45665612
how so?
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>>45665682
Darkness is absence of light so turned off flashlight basically "emits" darkness.
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>>45665670
hey fucktard, im talking about people crying about travelling at near the speed of light causing hundreds or thousands of years to go by
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>>45665702

string theory basically says if you time travel, you are placed in an alternate universe where your actions make sense.
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>>45665682
>>45665709
The short answer to "can I create an opposite flashlight" is "yes", but the disappointment here is that anti-photons and photons are the same particles. Some particles are their own antiparticles, notably the force carriers like photons, the Z boson, and gluons, which mediate the electromagnetic force, the weak nuclear force, and the strong force, respectively. Particles that are their own antiparticles must be electrically neutral, because an aniparticle has the opposite electrical charge as its partner particle. Other things must also be zero, like the number of quarks. A neutron cannot be its own antiparticle because it is made up of quarks and an antineutron is made up of antiquarks. A pi_0 is made up of a quark and an antiquark and is in fact its own antiparticle also.
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>>45665140
Fuck you.
We need to get into space as soon as possible.
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>>45665651
Did you post that on reddit?
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>>45665721
Well that's a damn shame. Wish I could understand half of what you said. Physics major?
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>>45665670
this isnt a thread about GPS accuracy, its a thread about space travel

literally:
>>>/out/
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>>45664785
You just need some speed force.
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>>45665746
no, this is intro physics from my college
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>>45665774
Where did you go to college?
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>>45665733

>that edgemaster writing
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>>45665788
northwestern, I am a senior right now (comp eng. major)
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>>45665717
You know, I've always held myself to that theory. I never knew that it was string theory. I mean, considering that all it takes for a universe to be alternate, is for a single atom to be moved out of place. Therefore, the whole 'time travel can't exist because there are no time travellers' is moot. I never realised that's what string theory was pedalling.
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>>45665717
complete bullshit, there is nothing inherently in string theory that directly infers the multiverse is a thing
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this >>45665838
Although I'd wish there was, maybe this way I could meet mai waifu ;_;
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>>45665828
The Higgs boson bitch slapped String Theory. It basically proved that the Grand Unified is going on the right path.
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>>45664998
Nuclear propulsion could get you there in only one or two lifetimes. There's some direct fusion designs that could work better than the old messy Project Orion.
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>>45665877
the higgs boson did nothing to disprove sting theory

the fact supersymmetry hasn't been proven at the levels we were testing for the higgs has slaughtered it and many other models, thing with string is it's so fucking generic it can rebound from this shit
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>>45665877

the LHC's upgrade due to be completed early 2015 gives me a chubby.

nearly DOUBLE the power.
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>>45664785
We need negative energy and a proof that says we can violate causality. According to relativity, FTL travel of any kind, even wormholes is time travel and time travel leads to time paradoxes.

See more on why here:
http://www.phys.vt.edu/~takeuchi/relativity/notes/section10.html

http://physics.stackexchange.com/questions/128075/how-would-wormhole-based-ftl-violate-causality
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What about the whole 'the closer you travel to the speed of light, the slower you experience time' malarkey? Basically Interstellar, but I'm only using the movie as a reference because I'm not very good at explaining it.
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>>45665475
Muh dick
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>>45665938
LHC-tan is so moe, I'd jog in it's corridors along with flying particles for at least few laps.
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>>45665795
>it's edgy, therefore...
Time to calm down autist.
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>>45665877
You are literally wrong. Even with the Nambu-Goto action you get a 0-spin scalar field, faggot.
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>>45666068
and now we get back to genericism
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>>45666068
>>45666170
no serious scientists are into String Theory, didn't you guys see that episode of the big bang theory?
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>>45666209
ikr? their such looooosers
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>>45665963
See Time Dilation http://en.wikipedia.org/wiki/Time_dilation

It has already been mentioned numerous times in this thread.
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>>45664998
80 000 km/h is slow as molasses just to travel around the solar system. It's achievable with gravity slingshots.

A primitive inter-system spaceship would accelerate much more than that, just by bothering to use a thruster.
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>>45665144
>>45665161
>>45665338
Also keep in mind that Alcubierre himself dosn't think this would actually work as anything other than a thought experiment. And the story that "NASA is working on it" is overblown, they are trying to develop a way to detect if space might be warped in this manner in other galaxies, not trying to build one themselves.

There is also the issue that if you could build an Alcubierre drive, you could also use it to go back in time and cause time paradoxes.
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>>45666666
6 sixes
all hail the get
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>>45666666
6 sixes get, warpdrives won't happen.
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>>45666666
>six sixes
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>>45666666
checked n' kek'd
>>
>>45666666
Dayum, confirmed
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