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PTYS_411_511_3_moon_history

PTYS_411_511_3_moon_history - History of the Moon PTYS...

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PTYS 411/511 Geology and Geophysics of the Solar System Shane Byrne – [email protected] Background is from NASA Planetary Photojournal PIA02418 and PIA00404 History of the Moon
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PYTS 411/511 – History of the Moon 2 Moon (mostly 4.5 – 3.0 Ga) Formation events Basin sequences Plains volcanism Tectonics Surface activity on the Moon mostly died off ~3 Ga Surface history of Venus is only available from ~1.0 Ga onward 0.27 R E 1.00 AU Surface activity and history of Mars spans its entire existence …as opposed to… In This Lecture
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PYTS 411/511 – History of the Moon 3 5 th largest satellite in the solar system Rock-like density No atmosphere So no wind action e.g. sand dune No river channels or rainfall etc… Critical body for planetary science Much of what we do in studying solid planets started with work on the Moon Simpler to understand than most planets
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PYTS 411/511 – History of the Moon 4 Easy to get to – heavily visited by spacecraft Late 1950s to early 1970s Robotic craft from the USA & USSR Ranger Lunar Orbiter Surveyor Luna Robotic Rovers (USSR) Lunokhod Manned missions (USA) Apollo 1990s Clementine Lunar Prospector
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PYTS 411/511 – History of the Moon 5 More missions Chandrayaan (India) Chang’E (China) Kaguya (Japan) Smart 1 (Europe) LRO (USA) – launching soon
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PYTS 411/511 – History of the Moon 6 No one knew what the far side of the Moon looked like until 1959 Soviet Union launched Luna 3 Far-side looks nothing like the near side No Maria Near side Far side
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PYTS 411/511 – History of the Moon 7 Maria Highlands (Terrae) Low elevations High elevations Darker Brighter Few craters Many craters (saturated) Smooth Rough Volcanic features Few volcanic features Basalt Anorthosite
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PYTS 411/511 – History of the Moon 8 The Moon is a really simple planet Craters Simple craters <18km diameter Complex craters >18km diameter Multi-ring basins Pervasive ‘gardening’ from micrometeroites Upper few km of the crust is fractured Upper few meters has been turned into regolith Geologic features on the Moon Moltke – 1km Euler – 28km Orientale – 970km
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PYTS 411/511 – History of the Moon 9 Overlapping stratigraphy of large impact basins Several km of relief Orientale Basin
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PYTS 411/511 – History of the Moon 10 Volcanic features on the Maria Lava flow fronts Sinuous rilles (Collapsed lave tubes) Vents and domes
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PYTS 411/511 – History of the Moon 11 Facts to consider Moon depleted in iron & volatile substances
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