- #1
M31
- 4
- 0
Hello all,
I have just discovered (and joined) the Physics Forums, and want to ask a question which I have been wondering about for a long time (please forgive me if this has been covered here before):
How do we know that the speed of light is constant throughout the universe if we have not been beyond the edge of the solar system yet (I don't know where the Pioneer probes are nowadays, so that's why I say that)?
I can see how one would base a result from experiments between the Earth, and say the Moon, Mars, etc... but how do we know how light behaves beyond the solar system? In the event (only for the sake of discussion) that light behaves altogether differently in other regions of space (I couldn't even begin to hazard a guess why), wouldn't that throw off calculations of distances and possibly the age of the universe, by some degree?
If this has been discussed elsewhere, can someone please post references?
Thanks for your time (no pun intended),
M31
I have just discovered (and joined) the Physics Forums, and want to ask a question which I have been wondering about for a long time (please forgive me if this has been covered here before):
How do we know that the speed of light is constant throughout the universe if we have not been beyond the edge of the solar system yet (I don't know where the Pioneer probes are nowadays, so that's why I say that)?
I can see how one would base a result from experiments between the Earth, and say the Moon, Mars, etc... but how do we know how light behaves beyond the solar system? In the event (only for the sake of discussion) that light behaves altogether differently in other regions of space (I couldn't even begin to hazard a guess why), wouldn't that throw off calculations of distances and possibly the age of the universe, by some degree?
If this has been discussed elsewhere, can someone please post references?
Thanks for your time (no pun intended),
M31