Which of the following puzzles in the solar system cannot be explained by a giant impact event?
A) the backward rotation of Venus
B) the extreme axis tilt of Uranus
C) the large metallic core of Mercury
D) the formation of the Moon
E) the orbit of Triton in the opposite direction to Neptune's rotation
E
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To keep a telescope fixed on a stellar target over time as Earth rotates, the telescope must have a/an _____________________
Fill in the blank(s) with correct word
While the photosphere produces chiefly visible light, most coronal energy is in the form of
A) infrared radiation. B) ultraviolet light. C) X-rays. D) gamma rays. E) radio waves.
If the masses of two planets doubles and the distance between them reduces by half, the force between them would be
A) unchanged. B) half as much. C) twice as much. D) four times as much. E) none of the above
The direction in which the potential changes at the greatest rate is in the direction
A) of the gradient of the potential. B) perpendicular to the electric field. C) perpendicular to the gradient of the potential. D) of the partial derivative with respect to x. E) cannot be determined