The Moon.

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Presentation transcript:

The Moon

Albedo of the Moon 7% opposed to Earth’s 31% Sun-side temperatures can reach 127ᵒC Dark-side temperatures can reach -173ᵒC

Highlands and Maria Highlands are heavily cratered regions of the Moon that are light in colour and mountainous. Maria are smooth plains that appear dark (analogous to ocean/water reservoirs)

Craters Ejecta: Material that is blasted out during impacts that eventually fall back to the surface Rays: Long lines of ejecta that radiate outward from an impact site. Rilles: meandering (curving), valley like structures that might be collapsed lava tubes

Is the Moon geologically active?

Composition Made up of silicates (Si & O compounds) Highlands are made of lunar breccias (made of plagioclase feldspar) Maria are predominantly basalt (but with no water) Regolith Means ‘blanket rock’ A layer of loose rock covering solid rock

Seismic Activity on the Moon The Moon experiences quakes occur due to: Tidal dynamics under the surface Meteorite Impacts Thermal contraction / expansion Shallow moon quakes Moonquakes tend to persist for a long time because there is no water to dampen the process.

Seismic Activity on the Moon From 1969-1972, various Apollo missions placed 4 seismometers on the Moon that remained active until 1977 3000 meteorite impacts, 1700 meteoroid strikes, and 9 deliberate spacecraft crashes were recorded This lead to the mapping of the Moon’s interior.

Formation Theory Impact Theory

Formation Theory Fission Theory

Formation Theory Capture Theory

Visiting the Moon

Try This P. 774 Q: 1, 2, 4, 6

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