Misconceptions About the Universe
Can we see things travelling faster than light?
Check out Audible: http://bit.ly/AudibleVe
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.
Видео Misconceptions About the Universe канала Veritasium
Check out Audible: http://bit.ly/AudibleVe
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.
Видео Misconceptions About the Universe канала Veritasium
Показать
Комментарии отсутствуют
Информация о видео
Другие видео канала
What actually expands in an expanding universe?Why Gravity is NOT a ForceSpinning Black HolesWhy The Speed Of Light* Can't Be MeasuredIs Success Luck or Hard Work?Visualizing infinity. Is the universe infinite? the largest scalesIf the universe is only 14 billion years old, how can it be 92 billion light years wide?These are the asteroids to worry aboutThis equation will change how you see the world (the logistic map)Is This What Quantum Mechanics Looks Like?Parallel Worlds Probably Exist. Here’s WhyThe Bizarre Behavior of Rotating Bodies, ExplainedHalf the universe was missing... until now3 Perplexing Physics ProblemsHow Trees Bend the Laws of PhysicsDoes Planet 9 Exist?Beyond the Cosmic HorizonThe Absurdity of Detecting Gravitational WavesHow to Understand the Black Hole ImageThe Banach–Tarski Paradox