Why do astronomers suspect that Triton was a Kuiper belt object that was captured by Neptune?
A) It orbits Neptune in the opposite direction of Neptune's rotation.
B) It is too large to have been formed in the jovian nebula that formed Neptune.
C) It has an atmosphere and a measurable greenhouse effect.
D) It undergoes seasonal changes.
E) It is colder than any other moon or planet.
A) It orbits Neptune in the opposite direction of Neptune's rotation.
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According to Copernicus, retrograde motion for Venus must occur around
A) greatest elongation, when the planet is farthest from the Sun. B) inferior conjunction, when it passes between us and the Sun. C) superior conjunction, when the planet is on the far side of the Sun. D) quadrature, when the planet is 90 degrees away from the Sun. E) opposition, when the planet lies opposite the Sun in the sky.
The number of impact craters on the slopes of Tharsis volcanoes suggests that they have been inactive
A) since Mars formed 4.6 billion years ago B) for at least a billion years C) for at least tens of millions of years D) only for the last few hundred years
The gravitational effects of _______________ can confine some rings in narrow strands or keep the edges of rings sharp
Fill in the blank(s) with correct word
The gaps created by the planet Jupiter in the Asteroid belt are called ________.
A. Asteroid gaps B. Kepler gaps C. Jupiter gaps D. Kirkwood gaps