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Exam3 - Flashcards - The flashcards are formatted for...

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Small Moons Medium Moons
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Geological activity in past (300-1500km). No geological activity (<300km).
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Large Moons Medium and Large Moons
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Enough self-gravity to be spherical; have substantial amounts of ice; formed in orbit around jovian planets; circular orbits in same direction as planet rotation. Recent or ongoing geological activity; only six in this category, plus the Earth’s (>1500km)
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Small Moons Io
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Most volcanically active body in the solar system. Far more numerous; not enough gravity to be spherical; “potato- shaped.”
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Callisto Ganymede
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Largest moon in the solar system. No tidal heating or orbital resonances, but has a magnetic field.
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Rocky Planets Titan
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Only moon in the solar system which has a thick atmosphere; mostly nitrogen. Rock melts at higher temperatures; have enough heat for activity.
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Icy Moons Gap Moons
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Create gaps within a planet’s rings. Ice melts at lower temperatures; tidal heating can melt internal ice, driving activity.
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Trojan Asteroids Rings
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Formed from dust created in impacts on moons orbiting the planets. Asteroids that follow Jupiter’s orbit.
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Near-Earth Asteroids Orbital Resonance
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Any situation in which one object’s orbital period is a simple ratio of another object’s period (i.e. ½, ¼, or 5/3); two objects periodically line up with each other.
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