How Can We Tell That Some Stars Are Relatively Close

question 187

Multiple Choice

How can we tell that some stars are relatively close to us in the sky

• A)Some stars are occasionally eclipsed by the Moon, so they must be nearby.
• B)Some stars vary in brightness caused by sunspots we can see because they are so close.
• C)Some stars appear to be extremely bright and must therefore be very close to us.
• D)Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.

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