3 ms·

The light we see is from when the galaxy was closer. As the light left the galaxy and travelled towards us, the universe expanded "between" the photons and the

The light we see is from when the galaxy was closer. As the light left the galaxy and travelled towards us, the universe expanded "between" the photons and the galaxy.

piva00 7y ago
And how do we know that now the galaxy is much further away? Just by the red shift of the light emitted over time?
- undreren 7y ago
  As far as I understand, yes. The red shift of the light can be measured, which tells us for how long the light has traveled.