easy · Enhanced ACT science
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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