Has the last great prediction of Einstein’s general relativity finally been verified?

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For the past 90 years, the predictions laid out Einstein’s general theory of relativity have continued to be confirmed by experimental science. The last hold out is gravitational waves – the idea that certain gravitational events cause actual ripples in Spacetime. The problem is that the effects are almost beyond microscopic, so they are incredibly hard to detect. But have scientist done it? Have gravitational waves finally been directly observed??? Watch the episode to find out.

Gravitational Waves Extra Credit:

Nature article on rumor:
http://www.nature.com/news/has-giant-ligo-experiment-seen-gravitational-waves-1.18449

Lawrence Krauss’ tweet:
https://twitter.com/LKrauss1/status/647510799678750720

Comments:
Eshan Das
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NOBUNAGA1991
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aaroNiGHTS
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Tim Pipp
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Marse Petrarse
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Procyon Beta
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dentoncrimescene
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The prospect of interstellar travel is no longer sci-fi. It COULD be achievable within our lifetime! But, how would an interstellar rocket-ship work? On this week’s episode of Space Time, Matt talks options for interstellar travel – from traditional rocket fuel to antimatter drives, could we travel to other star systems? Watch this episode of Space Time to find out!

“Quantum Entanglement & Spooky Action at a Distance”:
https://www.youtube.com/watch?v=ZuvK-od647c

“The Real Meaning of E=Mc²”:
https://www.youtube.com/watch?v=Xo232kyTsO0

“Could You Fart Your Way To The Moon”:
https://www.youtube.com/watch?v=iaN0xg2VQSo

“The Speed of Light is NOT About Light”:
https://www.youtube.com/watch?v=msVuCEs8Ydo

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COMMENTS:

andrea papone
https://www.youtube.com/watch?v=msVuCEs8Ydo&lc=z12wh5ajgo3njhg4u04cdnkbut3kyrg4nl00k

Jai Kalra
https://www.youtube.com/watch?v=msVuCEs8Ydo&lc=z12guj5w0k2yvhqws04cib4rtwmmj1ix0zo0k

RedStefan
https://www.youtube.com/watch?v=msVuCEs8Ydo&lc=z12ac5iogm3pjf1mq22vgr4ify2puf0wr04

TheColonel
https://www.youtube.com/watch?v=msVuCEs8Ydo&lc=z13nwvgr5wa1ubto004cfrg44vubhrarca0

Tyler Hamilton
https://www.youtube.com/watch?v=msVuCEs8Ydo&lc=z12utzqokkzsx1rxu04cgpgpomjscboohsg0k

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The speed of light is often cited as the fastest anything can travel in our universe. While this might be true, the speed of light is the EFFECT and not the CAUSE of this phenomenon. So what’s the cause? On this week’s episode of Space Time, Matt helps explain what the speed of light REALLY is and why it’s the cosmic speed limit of our universe!

“The Real Meaning of E=mc²”:
https://www.youtube.com/watch?v=Xo232kyTsO0

“Are Space And Time An Illusion?”:
https://www.youtube.com/watch?v=YycAzdtUIko

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SOURCES:

Einstein’s derivation or the Lorentz transformation from the invariant speed of light:
Einstein, Albert (1916) “Relativity: The Special and General Theory”
http://www.archive.org/stream/cu31924011804774#page/n159/mode/2up

Lorentz Transformation without invariant speed of light, from relativity, isotropy, and consistency of frame transitions (closure group postulate):
von Ignatowsky, “Das Relativitatsprinzip,” Archiv der Mathematik und Physik 17, 1–24 (1911)

Berzi1 & Gorini, J. Math. Phys. 10, 1518 (1969)
http://dx.doi.org/10.1063/1.1665000

Pelissetto & Testa, American Journal of Physics, 83, 338, (2015) “Getting the Lorentz transformations without requiring an invariant speed”
http://arxiv.org/abs/1504.02423

https://en.wikipedia.org/wiki/Derivations_of_the_Lorentz_transformations

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COMMENTS:

Denny Hiu
https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z124w3dhotmtx34lk224wzxyhwqufdefe

. (RadimaxRadimaX)
https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z124xv145zzkzpiei233spnqjzraejjig04

Epsilon Lazerface
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LassieDog999
https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z12zz13iezrqh142k23kitgxuqjqy35su

Tenebrae
https://www.youtube.com/watch?v=AwwIFcdUFrE&lc=z134yj2pcvrkhnu4u04ccdxhuufvuvkomd0

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REFERENCES:

Krauss & Scherrer 2007 http://arxiv.org/abs/0704.0221

Vardanyan, Trotta & Silk, 2011 http://arxiv.org/abs/1101.5476

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Lots of people believe the Universe is infinite, but there’s a good possibility that might not be the case. Which means that there would be an actual edge of the Universe. What happens at that edge? Is there a restaurant? Join Matt on this week’s episode of Space Time as he explores the greatest expanses of our Universe. So what do you find when you reach the edge? More Universe? Bubble Universes? Back where you started?! Check out this episode of Space Time to find out!

Measuring The Size of The Universe:
https://www.youtube.com/watch?v=QXfhGxZFcVE

Space Used To Be Orange:
https://www.youtube.com/watch?v=3tCMd1ytvWg

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COMMENTS:

Squishina
https://www.youtube.com/watch?v=z3rgl-_a5C0&lc=z130vh1yaynszzt3y22ixvba5zazinoj204

shadowmax889
https://www.youtube.com/watch?v=z3rgl-_a5C0&lc=z13ptl1hwkujhnv3o23tx1qyiu2xdxyxl04

MrLewooz
https://www.youtube.com/watch?v=z3rgl-_a5C0&lc=z13nd5lpupycwdv3w22hjruqrpnyjj3qs04

izvarzone
https://www.youtube.com/watch?v=z3rgl-_a5C0&lc=z12jize5xo3luluvj22vet1ynz2cwh0hu04

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REFERENCES:

Krauss & Scherrer 2007 http://arxiv.org/abs/0704.0221

Vardanyan, Trotta & Silk, 2011 http://arxiv.org/abs/1101.5476

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SPACETIME IS BACK! And with this episode we welcome in Matt O’Dowd as the new host to rigorously take you through the mysteries of space, time, and the nature of reality. We’re starting off this new season with perhaps one of the most mysterious things of all — DARK MATTER. What is it? Where does it come from? And is it even real? Watch this episode of Space Time to find out!

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Comment Links

SafetySkull
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Agen0000
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Hey Spacetimers! The time has finally come – on this weeks episode of Spacetime we reveal the answers to our 2-Particle Challenge, as well as our winners! Unfortunately, Gabe must bid us farewell – but not before introducing (in the most epic way), Space Time’s new host!

Solutions:
http://bit.ly/particle_challenge

ABOUT MATT O’DOWD:
Matt O’Dowd spends his time studying the universe, especially really far-away things like quasars, super-massive black holes, and evolving galaxies. He uses telescopes in space to do it, and if those aren’t good enough he sometimes adds entire galaxies as gravitational lenses. Matt completed his Ph.D. studies at NASA’s Space Telescope Science Institute, followed by work at the University of Melbourne and Columbia University. He’s now a professor at the City University of New York and an Associate at the American Museum of Natural History’s Hayden Planetarium.

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Congratulations To Our Winners!

Newtonian Challenge:
Farbod Torabi
Elias Simon
Rahul Poddar
Eduardo Vila
Donald Loveland

Einsteinian Challenge:
Nick Lucid
Daniel Grimmer

If your name is listed above be sure to email pbsspacetime@gmail.com with your Full Name, Full Mailing Address, and preferred T-Shirt Size (small, medium, large, extra large etc.)

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Black holes! From Stephen Hawking to Interstellar, black holes are mammoths in the world of science AND sci-fi. But what exactly IS a black hole? Do events happen inside black holes? Are black holes really a hole? Are black holes really black?! Join Gabe on this week’s episode of PBS Space Time as he debunks popular black hole misconceptions, and rethinks what the term, ‘black hole’, even means. Thought you knew what a black hole was? Think again!

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Comment Links

hauslerful
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Andrew Brown
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Ivan Chagas
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ErgoCogita
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The Science Asylum
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Romesh Srivastava
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shoofle
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gottabweird
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Madhu Sujan Paudel
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Tim VanBuren
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Dox
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It’s time for another t-shirt challenge question! Make sure you’re brushed up on your math and high-school level physics before trying this one! There will be 5 winners from each challenge! Do NOT submit to both!

Email your answers to: pbsspacetime@gmail.com before 5pm NYC time August 24, 2015.

Make SURE you title your email: “Two-particle Newtonian gravity challenge”

For the Einsteinian challenge title your email: “Two-particle Einsteinian gravity challenge”

Good luck! And we will see you next week on Spacetime for Gabe’s final episode.

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We all know tides have something to do with gravity from the Moon and Sun, but if gravity affects the motion of all objects equally, then how come oceans have large tides while other bodies of water don’t? It’s because your mental picture of the tides is probably WRONG!!! Join Gabe on this week’s episode of PBS Space Time as he sets the record straight on tidal force, gravitational differential and what role the moon actually plays in tides. Why don’t lakes have tides? Watch the episode to find out!

Emily Rice (NASA Space Apps Challenge talk on Exoplanet Atmospheres):
https://www.youtube.com/watch?v=rYGTZkueKWc&t=6s
https://about.me/emilyrice

Sean Carroll (lecture notes on general relativity):
http://ned.ipac.caltech.edu/level5/March01/Carroll3/Carroll4.html

For Additional Info on tides:
https://www.youtube.com/watch?v=gftT3wHJGtg https://www.youtube.com/watch?v=KlWpFLfLFBI

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COMMENTS:

Johan ‘t Hart
https://www.youtube.com/watch?v=AwhKZ3fd9JA&lc=z13mz50oqu2liptvs22qv5vjunjvv3ctp

Marcos MH
https://www.youtube.com/watch?v=AwhKZ3fd9JA&lc=z122splo5zukxlg5104cc11p5qm0yrtxojc

Campbell McLauchlan
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Pedro Gusmão
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Michael Winter
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Anthony Englert (antenglert)
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Ciroluiro
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electrocat1
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dligac
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KRIGBERT
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Mark G
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Arunabha D.
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Iwon’t tellmyname
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The Final Installment of our General Relativity Series!!!

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We’ve been through the first few episodes of our crash course on general relativity, and came out alive! But it’s officially “time” for CURVED spacetime. Join Gabe on this week’s episode of PBS Space Time as he discusses Newton and Einstein’s dispute over inertial frames of reference. Is Einstein’s theory inconsistent? Is gravity even a force??? Check out the episode to find out!

Previous Installments of the General Relativity Series:

“Are Space And Time An Illusion?”:
https://www.youtube.com/watch?v=YycAzdtUIko

“Is Gravity An Illusion?”
https://www.youtube.com/watch?v=NblR01hHK6U

“Can A Circle Be A Straight Line?”
https://www.youtube.com/watch?v=D3GVVkPb3OI

“Can You Trust Your Eyes In Spacetime?”:
https://www.youtube.com/watch?v=P4rW_pPbD-U

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll