All Questions
5
questions
3
votes
3
answers
209
views
One-Way Speed of Light and the Big Bang
Variations on this question have been asked a few times (e.g. here, here, and a few YouTube videos here and here). The claim seems to be that because we can only measure the round-trip speed of light, ...
- 106
1
vote
0
answers
60
views
Why is the age of the universe $=D/v$, despite that $v$ is not constant with time?
I am watching a series of lectures by the Noble prize laureate Brian Schmidt and Paul Francis and in this episode (at 4:20) they make the simple assumption that a galaxy receding from us due to the ...
- 157
4
votes
1
answer
313
views
Hubble's constant measured by observer approaching light speed
I recently read about expansion of the universe and I can't figure out if Hubble's law (and other models of expansion of the universe) is compatible with the theory of relativity.
My question is: In ...
- 149
0
votes
3
answers
152
views
Observing a point 13.82b ly away, 1b years ago
I understand that we can observe far away galaxies to get an idea how the universe looked like in the past.
Assuming the universe is 13.82b years old, would it be correct to say that if we looked at ...
- 153
12
votes
6
answers
2k
views
How large is the universe?
We know that the age of the universe (or, at least the time since the Big Bang) is roughly 13.75 billion years. I have heard that the size of the universe is much larger than what we can see, in other ...
- 3,439