easy · Act reading
According to the Big Bang Theory, the universe is expanding, causing light from distant galaxies to shift toward the red end of the spectrum (redshift). The further away a galaxy is, the faster it appears to be moving away from Earth, resulting in a greater redshift.
If Galaxy A has a greater redshift than Galaxy B, what can be concluded about their relative positions?
- Galaxy A is actually closer to Earth, but it is moving so fast that its light bypasses the blue end of the spectrum entirely by accident.
- Galaxy A is located at a greater distance from Earth than Galaxy B and is receding at a higher velocity due to the expansion of space.
- The redshift in Galaxy A is caused by the fact that it is composed entirely of red stars, while Galaxy B is composed entirely of blue stars.
- All galaxies in the universe will eventually collide at a single point because the expansion of space is a temporary illusion seen only from Earth.
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