Misconceptions About the Universe
Δημοσιεύτηκε στις 27 Μαΐ 2014
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.
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.
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