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Originally Posted by Sam5
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Originally Posted by snowflakeuniverse
Time dilation should increase the observed duration of the 1asn by a factor of (1 +z). This time dilation is observed in that the light curves of high red shift supernovas; the “explosion” takes longer to occur the greater the red shift. (Generally).
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This is caused by a classical Doppler shift that has nothing to do with “relativity”, and it is not “time dilation”. It is caused by an increasing delay in the signals arriving at an observer. |
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Originally Posted by jerry
Cougar has argued the exact opposite (I think it was you, Cougar, sorry if it was someone else), and you are both wrong. It is Doppler, and a very high recessional speeds, it is relativistic Doppler and it does involve relativistic time dilation - how else could you have redshifts greater than one? Without relativity, this would mean exceeding the speed of light.
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Doppler? You guys certainly love to take positions that 99% of the astrophysical community have rejected! Doppler effects are caused by motion through space. The distance is increasing between us and these distant bodies, but not because they're moving through space - it's because the space between us and them is expanding. Therefore this is not termed a doppler effect.