Mercury_Notes

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12 Terms

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Mercury
The innermost planet of the solar system, hard to see with optical telescopes, with a rotation period of 59 days and orbits the Sun in 88 days.
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Solar day on Mercury
Equal to two Mercury years due to its long rotation and short orbit around the Sun.
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Atmosphere of Mercury
Not detectable because it is too hot, too small, and too close to the Sun.
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Temperature range on Mercury
Night side temperature is around 100 K, day side temperature is around 700 K, and polar temperature is about 125 K.
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Craters on Mercury
Similar to the Moon, but less deep due to low gravity; older craters may be filled with volcanic activity.
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Scarps
Long cliffs on Mercury formed when the crust cooled, shrank, and split.
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Caloris Basin
A large impact feature on Mercury, about 1400 km wide, with rings of mountains and indication of volcanic activity.
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Magnetic field of Mercury
Very weak, about 1/100th as strong as Earth's, possibly due to slow rotation.
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Core of Mercury
Probably iron-rich, contributing to the planet's weak magnetic field and geology.
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Geological activity on Mercury
Geologically inactive for the last 4 billion years; past activity included volcanism, melting, bombardment, and slow cooling.
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Plate tectonics on Mercury
Did not develop due to fast cooling.
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Orbit of Mercury
Exhibits a daisy pattern.