Question

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Using the Doppler effect, astronomers can determine a star’s ____.
temperature
chemical composition
movement toward or away from Earth
age

Answer 1

Answer:

The answer is movement toward or away from Earth.

In astronomy, it is said that the Doppler effect tells Astronomers whether a star, or galaxy, is approaching or going away from us. It turns out the farther a galaxy is away, the faster it gets away from us - meaning that the Universe is expanding.

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Answer 2

The answer is a movement toward and away from earth

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