Misconceptions About the Universe

Can we see things travelling faster than light?
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Music by Amarante “One Last Thing” http://bit.ly/VeAmarante
Awesome animations by http://youtube.com/minutephysics
Thanks to Prof. Geraint Lewis for input on earlier drafts of this video.

The expanding universe is a complicated place. During inflation the universe expanded faster than light, but that’s something that actually happens all the time, it’s happening right now. This doesn’t violate Einstein’s theory of relativity since nothing is moving through space faster than light, it’s just that space itself is expanding such that far away objects are receding rapidly from each other. Common sense would dictate that objects moving away from us faster than light should be invisible, but they aren’t. This is because light can travel from regions of space which are superluminal relative to us into regions that are subluminal. So our observable universe is bigger than our Hubble sphere – it’s limited by the particle horizon, the distance light could travel to us since the beginning of time as we know it.

Have we reached the end of physics? | TED Talks – Harry Cliff

 

Why is there something rather than nothing? Why does so much interesting stuff exist in the universe? Particle physicist Harry Cliff works on the Large Hadron Collider at CERN, and he has some potentially bad news for people who seek answers to these questions. Despite the best efforts of scientists (and the help of the biggest machine on the planet), we may never be able to explain all the weird features of nature. Is this the end of physics? Learn more in this fascinating talk about the latest research into the secret structure of the universe.

TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment and Design — plus science, business, global issues, the arts and much more.
Find closed captions and translated subtitles in many languages at http://www.ted.com/translate

Now streaming | Perimeter Institute

A panel of researchers from Perimeter Institute for Theoretical Physics will discuss the meaning and implications of LIGO’s announcement regarding the search for gravitational waves. The panel will include Perimeter Director Neil Turok, along with Faculty members Asimina Arvanitaki, Latham Boyle, and Luis Lehner. Science journalist Kate Lunau will moderate the discussion. Watch the live LIGO announcement 10:30am EST here: https://www.webcaster4.com/Webcast/Page/219/13131 Read “Gravitational Waves Detected, New Era of Cosmology Begins”: https://www.perimeterinstitute.ca/news/gravitational-waves-detected-new-…

Source: Now streaming | Perimeter Institute

The Meaning of E=mc^2

You’ve probably seen E=mc2 somewhere, in science class or maybe in cartoons or other pop culture ephemera, but if you really want to know what it means, listen to World Science Festival co-founder and Columbia University physicist Brian Greene’s explanation above. Then, once you have the basics of the relationship between mass and energy, go check out the Mass-Energy Scale from Minute Labs. Would you be surprised to know that the amount of energy used by the Large Hadron Collider in one year is roughly equivalent to the mass of an ounce of feathers?

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Why Einstein Hated Quantum Mechanics

Alan Alda and World Science Festival co-founder and Columbia University physicist Brian Greene held a lively discussion of Einstein’s frustrations with quantum mechanics—accompanied by a simple-but-mind-blowing demonstration of Einstein’s theory of general relativity as it applies to gravity.  Continue reading