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Physics, Astronomy & Cosmology / Where was Earth when a photon left a galaxy X>4 billion years ago?
« on: 17/08/2021 02:04:14 »
Hello,
I've been asking the same question for some time... lots of smart people have provided answers but I still don't get it and I'd like to ask again:
When a photon left a galaxy, let's say 8 billion years ago, and we think our Solar System is 4 BY old, where was the spacetime that Earth occupies now (since Earth did not exist 8 BY ago) ??
I've been asking the same question for some time... lots of smart people have provided answers but I still don't get it and I'd like to ask again:
When a photon left a galaxy, let's say 8 billion years ago, and we think our Solar System is 4 BY old, where was the spacetime that Earth occupies now (since Earth did not exist 8 BY ago) ??