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Question
The number of confirmed extrasolar planetsA) is about 600, and is not expected to rise very much.
B) has been decreasing as some observations thought to be planets have been disproven.
C) is about 800, and is rising slowly, as observations are quite difficult.
D) was about 800 at the time of publication but is rising rapidly due to new observations by the Kepler spacecraft.
E) is zero; there are observations thought to be of extrasolar planets but none has yet been confirmed.
Answer
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