3 ms·
I am confused, as a lot of sources (e.g. [1]) make a distinction between doppler and cosmological redshift. When you say "change our relativistic reference fra
by mannykannot 7y ago
I am confused, as a lot of sources (e.g. [1]) make a distinction between doppler and cosmological redshift.
When you say "change our relativistic reference frame to match a distant galaxy's", do you mean as that frame was when the photon was emitted, or as it is when it is detected here? (if that is a well-defined distinction under relativity?)
[1] https://calgary.rasc.ca/redshift.htm https://calgary.rasc.ca/redshift.htm
- bananabreakfast 7y agoSo that source draws a line between cosmological redshift and doppler redshift that is so misleading I'd say it's wrong. They are in fact equivalent [1] and basically just depend on your reference frame. Check out the wikipedia page on Hubble's Law [2] for more. [1] https://arxiv.org/abs/0808.1081 https://arxiv.org/abs/0808.1081 [2] https://en.wikipedia.org/wiki/Hubble%27s_law https://en.wikipedia.org/wiki/Hubble%27s_law