Moon - Moon's surface changes slowly History of Moon (best...

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Moon Surface observe mountains o higher than on Earth (no erosion, less surface gravity) craters o impacts of meteors canyons o from old lava flows - not water We classify the land as maria (seas) o dark color o from lava flows o 15 % of moon (mainly on the near side) o age: 3 billion years highlands o light colored o heavily cratered o 85 % of moon o age: 4.5 billion years Figure 6.8 shows these features for the near and far sides. surface ages are 3 - 4.5 billion years => moon has not changed much since formation mainly silicate rocks (like Earth) no water in the rocks (but maybe some ice in certain craters ?) Atmosphere almost none weak gravity => everything escapes observe some hydrogen, helium, argon passing through from outgassing of rocks no weather, no wind, no rain => no erosion
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Unformatted text preview: Moon's surface changes slowly History of Moon (best model to date) We need to explain: moon has little iron moon has no water maria are mainly on near side of moon terms: planetisimal = very large rock or collection of rocks (small planet) protoplanet = almost a final planet Earth - Moon system: Tidal forces of gravity results in 1. tides of Earth 2. synchronous rotation of moon Force of gravity depends on distance. force is stronger on the near side of Earth and Moon Figure 6.21 provides a more detailed view of this concept. [Link to Figure 6.21] Tides on Earth Solid Earth can not stretch much - but water can. so we get two high tides each day (not equal in size)...
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This note was uploaded on 03/09/2012 for the course AST 1002 taught by Professor Emilyhoward during the Spring '10 term at Broward College.

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Moon - Moon's surface changes slowly History of Moon (best...

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