If Earth rotated twice as fast as it currently does, but its motion around the Sun stayed the same, then
(a) the night would be twice as long;
(b) the night would be half as long;
(c) the year would be half Chaisson, Eric

(b) the night would be half as long

Explanation:

As the earth, if rotated twice as fast than it does now and the sun stayed the same then the night would be as half as long as the rotation of the planet on its axis would be double to that of its and 12 hours of night would be as long as the speed of the axial rotation.

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