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What's up with dark matter/energy?
Do we really not know what 95% of the universe is made of?
What could it possibly be?
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something something quantum mechanics, something something consciousness
commence autism
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>>8295287
So called gravitons.
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It is possible that they're doing the math wrong, and the universe is mostly just 'normal' matter?
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Four prisoners are arrested for smoking weed, but the jail is full and the jailor has nowhere to put them. He eventually comes up with the solution of giving them a puzzle so if they succeed they can go free but if they fail they are executed.
The jailor puts three of the men sitting in a line. The fourth man is put behind a screen (or in a separate room). He gives all four men party hats. The jailor explains that there are two black hats, and two white hats; that each prisoner is wearing one of the hats; and that each of the prisoners only see the hats in front of him but not on himself or behind him. The fourth man behind the screen can't see or be seen by any other prisoner. No communication among the prisoners is allowed.
If any prisoner can figure out what color hat he has on his own head with 100% certainty (without guessing) and tell the jailor all four prisoners go free. If any prisoner suggests an incorrect answer, all four prisoners are executed.
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Try to solve.
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Gang up on jailor
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If nobody figures this out, will you explain?
Anonymous
Arianespace Launch LIVE 2016-08-24 21:23:14 Post No.8294565
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Arianespace Launch LIVE 2016-08-24 21:23:14 Post No.8294565
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Get in here faggots:
>http://www.arianespace.com/mission/ariane-flight-va232/
T minus 00:18:00
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Bezos Bump
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Stream is Live
T minus 00:06:39
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>Ariane5
>13,000kN Thrust
Pic related
Anonymous
getting started with Quantum Mechanics?? 2016-08-24 21:01:40 Post No.8294518
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getting started with Quantum Mechanics?? 2016-08-24 21:01:40 Post No.8294518
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getting started with Quantum Mechanics??
Anonymous
2016-08-24 21:01:40
Post No. 8294518
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How much maths do I need to start quantum mechanics? Lets assume I have essentials such as calc 1 and 2 only.
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>>8294518
To start it's mostly linear algebra and real analysis (I don't know American college memes).
Once you get into QFT you'll need complex analysis.
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>>8294518
banach space.
Which one do you believe takes a more prominent role in peoples personalities. Personally I believe that nurture is the biggest role. The best way to raise a child is to teach them that waiting for a greater reward is better than having instant satisfaction as tested in the Stanford marshmallow experiment.
What is /sci/'s thoughts on this?
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This is gonna be a delicious /pol/ vs reddit shitfest. *Grab popcorn*
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This is retarded meme that is decades old. It's always about gene-environment interaction. There is no one or the other. It's always both.
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Nurture is more important
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>theory of relativity is almost 100 years old
I thought Science was supposed to advance knowledge not just jerk off with it?
Why are today's scientists so useless?
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>>8294361
Well yeah it sucks.
>we live in an era where you can get a Nobel Prize for inventing the blue LED
Don't get me wrong, it's a fine invention, but not a discovery. The future of physics doesn't look so good.
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>>8294361
It's more like Einstein was 100 years ahead.
>gravitational waves
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>>8294361
its the retarded threads that hold the science back
sage
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I don't perceive Neil deGrasse Tyson as particularly intelligent. Why is he special?
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>>8294352
Unlike most astronomers, he can appear on TV and not put the audience to sleep.
Which is a good thing, those NASA bucks don't come from nowhere nigguh.
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>>8294352
Melanin.
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He is like any average experimental astrophysicist, except he does not have autism.
Do you want the universe to restart in a big crunch or slowly fade into nothingness (heat death)?
The latter sounds quite comfy to be quite desu.
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>>8294281
Couldn't a big crunch just result in the universe being exactly the same so everything you do is repeated forever
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>>8294317
The chances approach zero.
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>>8294324
But why would the conditions be different a second time
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ESO (European Southern Observatory) discovered an exoplanet around Proxima Centauri (4 light-years away only -- nearest star). Earth-like mass and within the habitable zone of the star. Presence of atmosphere unknown, but plausible. Next generation of telescopes (E-ELT, etc) will be able to find out.
>https://twitter.com/ESO
>https://www.theguardian.com/science/2016/aug/24/earth-like-planet-found-orbiting-our-suns-nearest-star-raises-hopes-for-life-proxima-b
>http://www.bbc.com/news/science-environment-37167390
>http://www.nytimes.com/2016/08/25/science/earth-planet-proxima-centauri.html?hp&action=click&pgtype=Homepage&clickSource=story-heading&module=second-column-region®ion=top-news&WT.nav=top-news&_r=0
>http://www.lemonde.fr/cosmos/article/2016/08/24/une-terre-temperee-autour-de-notre-plus-proche-etoile_4987469_1650695.html
(most complete general public article -- but in french)
Ayy lmaos are closer than we'd think
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What if it's already inhabited by an advanced civilization. Let the intergalactic wars begin.
>mfw scifi movies where actually training videos for war with the ayyy lmaos
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Transposing my post from /news/
I studied physics in undergrad and i grew to become numb to these headlines. It seems like everyday we're finding the newest most earth-like planet yet. This however is pretty cool because Proxima centauria is our closest fucking star. So we've found a new home right? Not quite yet.
Just because a planet is in the 'habitable zone' doesn't mean the planet is habitable at all, it just means it's in the ring where liquid water COULD be found on the planet. It could have toxic gases and oceans, constant tectonic movement leading to unstable ground and/or volcano explosions or any number of completely unimaginable things that would make it hell-on-earth so to speak.
Well let's stop being pessimists for a second and think about what being our closest star actually means. Can we travel there soon?
First let's consider the speeds. The fastest humans have ever gone is 40,000km/h.
"The current human speed record is shared equally by the trio of astronauts who flew Nasa’s Apollo 10 mission. On their way back from a lap around the Moon in 1969, the astronauts’ capsule hit a peak of 39,897km/h" http://www.bbc.com/future/story/20150809-how-fast-could-humans-travel-safely-through-space.
With this in mind, and to gain some perspective, let's imagine traveling to mars. In july 2018 we're apparently going to be pretty close to mars at only 57 million km. http://www.universetoday.com/14824/distance-from-earth-to-mars/
57,000,000km / (40,000 km/h) = 1425 h = 59 days which is about 2 months!
That's not very long at all... But keep in mind that 40,000 km/h was the fastest that Apollo 10 ever went. It obviously had to accelerate and decelerate.
Next let's talk about this planet.... (1/2)
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So let's try and get a lower bound for how long it would take to visit this planet. The planet is 1.3 parsecs away.
1.3 parsec = 4*10^13 km
4*10^13 km / (40,000 km/h) = 1,000,000,000 h
So at the max speed appolo 10 hit, it would take 1,000,000,000 h = 114,000 years
Well... that's not very comforting.
What about an unmanned voyage? Like a satellite or some shit.
To my surprise, the fastest thing we've ever launched was voyager 1. Around 2013 it was clocked at 17030 m/s [https://en.wikipedia.org/wiki/Voyager_1#Exit_from_the_heliosphere]
17030m/s=61,000 km/h
so this time it would take about 650,000 h = 75,000 years
Not much better realistically. So what does /sci/ know about the future of propulsion technology? What are some realistic (read as: safe) predictions for speeds that rockets can go within the next decade or two?
(2/2)
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Get in here! At 2:55 EST Philip Lubin will be presenting the most recent results of the "Directed Energy for Interstellar Study." The send shit to a star using lasers study.
Livestream.com/viewnow/NIAC2016
With today's proxima centauri exoplanet announcement, it should be pretty interesting
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neat, I don't know anything about what you just said but I'll watch it
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>>8294342
It's over already, though you could rewind it
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How much time do you spend on studies? How does one stay on task for long periods of time?
I notice that it is often hard for me to spend long periods of time focusing on Math, and I often need to take frequent short breaks or walks when I am doing hardcore studying.
Sometimes, I am not able to get an "real" work done, and instead focus on small semi-pointless-productive tasks that do not require me to think hard.
For example, I should be reading real analysis and numerical analysis textbooks and be working on problem sets right now, but I spent a lot of the day doing other things instead (planning for the week, catching up with old friends, working on a weekly budget, other pointless crap).
To some people, I would be considered "an ideal student" in that I have very good marks, have research experience, and will be graduating 2 years early. In reality, I know that I waste a lot of time and can do a whole lot better, and I wanted to know if anyone else here feels the same way or has any advice (especially those attending graduate school in math).
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Yes, pretty much.
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>>8294442
This
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>>8294442
ditto
Anonymous
What is the greatest mathematical achievement of the 20th century? 2016-08-24 16:55:09 Post No.8294068
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What is the greatest mathematical achievement of the 20th century? 2016-08-24 16:55:09 Post No.8294068
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What is the greatest mathematical achievement of the 20th century?
Anonymous
2016-08-24 16:55:09
Post No. 8294068
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in your opinion
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-1/12
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>>8294068
The fact that the rationals are countable like the naturals but can be infinitely divided like the reals blows my mind.
What even are the rational numbers? How can they have both of these properties at the same time? Like holy fuck, just this makes them more interesting numbers than the reals. I wonder why most people don't focus on the rationals when there are obviously many hidden theorems lying in this weird relationship the rationals have with the naturals and the reals where it is like an intermediate state of both.
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>>8294068
The invention of the atom
How do I keep these fuckers from looking like mushrooms or weird stickfigures bending over?
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>>8294047
Whoa, make it simpler. Seems like it took you 10 s to draw that.
_O_
Without the bottom of the O.
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This is how I draw omega, why you add the neck?
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>>8294047
Any tips on Beta not looking like a weird B and Epsilon looking decent?
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is there a cheap way to estimate [math]\left \| A^{-1} \right \| = \max_{x \ne 0} \frac{ \left \| A^{-1} x \right \| }{ \left \| x \right \|}
\newline z= A^{-1} x \newline A z = x ?[/math]
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>>8293936
[math]\left \| A^{-1} \right \| = \max_{x \ne 0} \frac{ \left \| A^{-1} x \right \| }{ \left \| x \right \|}[/math]
[math]z= A^{-1} x[/math]
A z = x [/math]
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>>8293940
Dose this help?
https://en.wikipedia.org/wiki/Operator_norm#Equivalent_definitions
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>>8293979
On [math]\mathbb{R}^{2}[/math] could be something like [math]||v||=1\iff v=e^{i\theta}[/math] so you have [math]||A^{-1}||=\sup_{\theta\in [0,\pi)}||A^{-1}(\theta)||[/math].
Anonymous
MIT Scientist Claims That This Pill Is the Fountain of Youth 2016-08-24 15:19:31 Post No.8293914
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MIT Scientist Claims That This Pill Is the Fountain of Youth 2016-08-24 15:19:31 Post No.8293914
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MIT Scientist Claims That This Pill Is the Fountain of Youth
Anonymous
2016-08-24 15:19:31
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Thoughts on this?
http://nymag.com/scienceofus/2016/08/is-elysium-healths-basis-the-fountain-of-youth.html
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>>8293914
>is Elysium healths basis the fountain of youth
No
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> grandoise claim
> huge marketing push already.
Sounds like someone's research funding is running dry and he is desperate for a golden parachute.
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>>8293914
>An MIT
Is the letter M a vowel now?