Chapter6.The Moon - craters on the Earth Reason 1 – Our...

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1 The Moon Chapter 6
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3 The Moon Radius = 0.272 R E =1738 km Mass = 0.0123 M E = 7.35x10 22 kg Density =3.34 gm/cm 3 Atmosphere = none Pressure = 0 Surface features = craters, mountains, maria
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12 July 1969
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14 How did we learn about the Moon’s internal structure?
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21 Impact craters are the result of objects penetrating a planet’s atmosphere Arizona crater is some 50,000 years
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22 Impact Crater Formation The velocities of rocks hitting the terrestrial planets is very high, by Earth standards (v = 21,600 miles/hr, or Mach 30!), which means an enormous amount of energy is released as it hits.
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23 So, why don’t we see a lot of
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Unformatted text preview: craters on the Earth? Reason 1 – Our atmosphere causes many rocks to “burn up” in the upper atmosphere before they would hit the Earth - Meteors Reason 2 – Our Earth is “active.” New rocks are constantly being formed, and older rocks eroded. Over time the craters disappear. 24 Lunar Eclipse 25 26 27 28 29 Tides Tidal Force ~ 1/r 3 30 31 32 The Moon’s tidal effect is about twice that of the Sun. 33 Slowing of the Earth’s Rotation Slowing confirmed by mirrors left on Moon by astronauts. 34 Crime Wave on the Moon…...
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Chapter6.The Moon - craters on the Earth Reason 1 – Our...

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