How Can Astronomers Tell That Some Stars Are Relatively Close

question 133

Multiple Choice

How can astronomers tell that some stars are relatively close to Earth?

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

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