Comet Halley Is Unique Because

question 42

Multiple Choice

Comet Halley is unique because

• A) it was the first comet whose return was predicted.
• B) it is a member of the Jovian family but has a retrograde orbit.
• C) its period is less than a human lifetime.
• D) it was successfully visited by a spacecraft.
• E) it was the brightest comet ever observed by humans.

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