Recent content by feddz
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Undergrad How do we measure expansion if we see distant galaxies in the past?
If the galaxies we see are as they were a few million years ago, then how do we know that the universe is expanding since we don't know their current velocities? Hubble's graph shows a linearly proportional relationship between velocity and distance but the fact that the further a galaxy is, the...- feddz
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- Expansion Universe
- Replies: 3
- Forum: Astronomy, Astrophysics, Cosmology