A comoving observer has constant comoving coordinates in a homogeneous expanding universe. Its physical separation from another comoving observer grows in proportion to the scale factor, giving relative recession governed by the Hubble parameter. Light exchanged between these observers undergoes cosmological redshift.

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  1. Comoving coordinate
  2. Scale factor (cosmology)
  3. Cosmology
  4. Branches of physics
  5. Physics
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