Why do the moons of Saturn have large amounts of methane and ammonia ice, but the moons of Jupiter do not?
answer
It was too warm for these ices to condense at Jupiter's distance in the solar nebula.
question
Which statement about synchronous rotation is true?
answer
It is a natural consequence of tidal forces acting on a moon.
question
Based on what we know about the terrestrial worlds, why is it surprising to find geological activity on jovian moons?
answer
They are too small.
question
Imagine another star system with a planet of the same mass as Jupiter orbited by a moon with the same size and orbit as Io. If this moon is not geologically active like Io, then which of the following is probably true?
answer
The planet does not have other large moons sharing an orbital resonance with this moon
question
Tidal heating is stronger for Io than for Europa because ________.
answer
Io is closer to Jupiter
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Scientists are currently planning a mission that should tell us definitively whether there is an ocean on Europa. This mission will do that in the cheapest way possible, which is to ________.
answer
measure how much Europa's surface bulges up and down as it rotates
question
Why would it be surprising to find large fish-like organisms with rapid metabolism on Europa?
answer
There does not seem to be enough energy available to support this type of metabolism.
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How do the possibilities for life on Ganymede and Callisto compare to those on Europa?
answer
Life seems less likely because these moons have less energy available for life.
question
Suppose you had the misfortune of finding yourself outside on Titan without a spacesuit. Which would probably kill you first
answer
the cold temperature
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Titan shares all of the following geological features with Earth except ________.
answer
volcanoes erupting with molten rock
question
Why were scientists surprised to find active geology on Enceladus?
answer
Because of its small size
question
Chemical disequilibrium is likely to be present in all the following places except ________.
answer
icy boulders in the rings of Saturn
question
The Jovian moons Ganymede and Titan are
answer
larger than Mercury but smaller than the Earth
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The fact that many of the larger Jovian moons orbit nearly in the equatorial plane of their host world, moving in the same direction as their planet's spin, suggest that they
answer
formed from a rotating disk of gas and dust like a miniature solar system
question
Triton, the largest moon of Neptune was probably once
answer
a Kuiper Belt Object
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Even though Jupiter's moon Io is similar in size to our geologically dead Moon, it is more geologically active than the Earth. How can this be?
answer
Io is tidally heated due to its elliptical orbit, which causes the large tidal forces exerted by Jupiter to constantly change, flexing and distorting its interior
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Life in the subsurface ocean of Europa will most likely consist of
answer
simple single-celled organisms
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In addition to being the second-largest moon in the solar system, Saturn's moon Titan, is
answer
the only moon to have its own atmosphere
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From a chemical energy standpoint, the basic requirement for life is a situation in which chemicals naturally exist in a state of
answer
disequilibrium
question
What is the origin of the nitrogen in Titan's atmosphere?
answer
breakdown of ammonia (NH3) by ultraviolet light from the Sun
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