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.

Question

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The Answer of 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.

Comet Halley Is Unique Because