A red supergiant star transitions into a type II supernova in this animation. Credit: W. M. Keck Observatory/Adam Makarenko | ...

Astronomers have found that the further from us a star is, the more its light is red-shifted. This tells us that: The further away a galaxy is, the faster it is moving away. Since we cannot assume ...

Hubble had already used this knowledge in his 1924 discovery that the Andromeda nebula, containing a variable star, was more ... the lines are shifted into the red part of the spectrum.

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Astronomers have found that the further from us a star is, the more its light is red-shifted. This tells us that: The further away a galaxy is, the faster it is moving away. Since we cannot assume ...