We Can Tell That Some Stars Are Relatively Close to Us

question 28

Multiple Choice

We can tell that some stars are relatively close to us in the sky because

• A) they appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.
• B) they appear to be extremely bright.
• C) they are occasionally occulted or eclipsed by our Moon.
• D) the light from these stars shows only a very small redshift caused by the universal expansion of the universe.

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Definitions:

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