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Question 1:
What properties of extrasolar planets make them difficult to detect?

Extrasolar planets orbit a star other than the sun. These planets are very distant from Earth. They are small and dark, and unlike stars, they do not emit visible light. (They only reflect the visible light of their star.) Therefore, extrasolar planets are faint to see. Imaging a planet is extremely difficult because it gets lost in the glare of its much brighter and larger host star.

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