Which two properties are most important in determining the surface temperature of a planet?
distance from the Sun and atmosphere
Rank the five terrestrial worlds in order of size from smallest to largest:
Moon, Mercury, Mars, Venus, Earth.
Which of the following most likely explains why Venus does not have a strong magnetic field?
Its rotation is too slow.
The relatively few craters that we see within the lunar maria
were formed by impacts that occurred after those that formed most of the craters in the lunar highlands.
The Caloris Basin on Mercury covers a large region of the planet, but few smaller craters have formed on top of it. From this we conclude that
he Caloris Basin formed toward the end of the solar system's period of heavy bombardment.
Why does Venus have such a great difference in temperature between its "no atmosphere" temperature and its actual temperature?
It has a large amount of greenhouse gases in its atmosphere.
How does Jupiter's core compare to Earth's?
It is about the same size but is 10 times more massive.
The fact that most moons always show the same face to their planet is
a natural consequence of tidal forces acting on the moons.
What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
Ice has a lower melting point than rock.
Why is Jupiter denser than Saturn?
The extra mass of Jupiter compresses its interior to a greater extent than that of Saturn.
The four Galilean moons around Jupiter are
a mixture of rock and ice, with the ice fraction increasing with distance from Jupiter.
Why are there no impact craters on the surface of Io?
Io did have impact craters but they have all been buried in lava flows.
Why isn't there a planet where the asteroid belt is located?
Gravitational tugs from Jupiter prevented material from collecting together to form a planet.
Halley's comet is named after the English scientist Edmund Halley because he
calculated its orbit and predicted that it would return in 1758.
Most of the planets discovered around other stars
are more massive than Earth and orbit very close to the star.
Why are many of the newly detected extrasolar planets called "hot Jupiters"
Their masses are similar to Jupiter but they are very close to the central star and therefore hot.
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