Chapter 6: Terrestrial Planets -The Moon
Earth’s interior is revealed by seismology, the study of earthquakes. Layers are revealed: A layered object: Inner core Outer core Mantle Crust Hydrosphere Atmosphere Magnetosphere
Earth’s Moon: the interior is not as well understood Missing: Hydrosphere Atmosphere Magnetosphere
Full Moon, Near Side
Far side of the Moon (taken by Apollo 16)
Near Side Far Side Two Faces of the Moon Maria Impact Basin Cratered Highlands
A12 A14 A15 A17 A11 A16 L24 L20 L16 Apollo and Luna Landing Sites
Moon, Close Up, craters, maria, and highlands
Meteoroid Impact causes craters and ejecta
Lunar Craters, big and small (microscopic, even)
Lunar Surface is blanketed in dust from small meteorites.
Lunar Tides are due to the gravity of the Moon
Solar and Lunar effects on Tides depend on the relative orientations of the Earth, Moon, and Sun
The tidal bulge is actually offset somewhat from being directly underneath the Moon. This produces a torque, a kind of twisting force on the Earth. The tides cause the Earth to slow down and the Moon’s orbit to increase in radius (4 cm per century). Also, the Moon’s rotation is synchronous with its orbit.
The Moon’s formation is believed to be due to a collision of a massive (Mars-sized) object with the early Earth. Computer simulation show that this could leave a moon- sized satellite in the correct orbit.
Lunar Evolution: the Moon after the early bombardment
Lunar Evolution: the formation of the maria by volcanic eruptions
Lunar Evolution: after 3 billion years of cratering
Large Lunar Crater (note smaller recent craters)