Sponge - What are two differences in lunar soil and soil on Earth?

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Sponge - What are two differences in lunar soil
and soil on Earth?
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Lunar Interior -The low average density (3
g/cm3) implies that the entire Moon is low in
iron and other heavy metals.
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The absence of a magnetic field could be the
result of the Moons slow rotation, or the
absence of a liquid core, or both.
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A 200 km radius core, a 500 km thick semi-solid
rock aesthenosphere, a 1000 km thick mantle, and
a 60 to 150 km thick crust is probable.
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The Moons crust is thicker than Earths. The
side near the Earth is about 65 km thick, the far
side is about 150 km thick.
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The difference in crust thickness explains why
there are no maria on the far side, it was a
shorter distance to the surface on the near side.
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This difference in crust thickness is probably
due to the Earths gravity pulling the denser
mantle closer to the Earth.
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Origin of the MoonThe Sister, or Co-formation,
theory - the Moon formed as a separate object
from the same material.
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Problem The Moon differs in density and
composition from the Earth.
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The capture theory- The Moon formed far from
Earth and was later captured by it.
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Problem Since the Moons mass is large compared
to the Earths, this capture probably couldnt
happen.
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The daughter, or fission theory - the Moon was
torn out of the Earth itself as a result of the
young Earths rapid spin, or due to tidal
effects from the Sun.
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Problem If the Earth spun this fast, it would
probably have torn the Earth completely apart.
Plus, the Moon would not be ejected into a
stable orbit in this case.
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The impact theory A glancing collision by a
large Mars-sized object with a young molten
Earth. The dislodged matter from our Earth then
assembled into the Moon.
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This is the only theory that fits all of the
evidence.
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Lunar Exploration Luna 1 (Russian) passed the
Moon on Jan. 4, 1959. Luna 2 crash landed in
Sept. and Luna 3 returned pictures of the far
side in Oct. of the same year.
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Luna 9 soft-landed in Feb. 1969. Several Luna
missions, including Luna 24 (the last), returned
with lunar surface material.
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Lunokhod
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Lunokhod was a robot that explored the surface
of the moon.
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The Ranger missions (USA) didnt hit the Moon
until Ranger 7 on June 28, 1964.The US also
sent five Lunar Orbiters (1966-67) and seven
Surveyor missions (1966-68) which soft-landed.
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On July 20, 1969 Neil Armstrong became the first
man to set foot on the Moon. On December 14,
1972 Harrison Schmidt was the last. This was
part of the Apollo program.
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Buzz Aldrin
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In all, 12 men have walked on the Moon over six
missions. The later missions brought a lunar
rover with them.
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Apollo 17 lunar blast-off
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Crater (center of image) formed by impact of the
Apollo 14 Saturn IVB booster. The booster was
intentionally impacted into the lunar surface on
February 4, 1971 to serve as an energy source to
probe the interior structure of the Moon using
seismometers placed on the surface by Apollo
astronauts NASA/GSFC/Arizona State University.
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382 kg of Moon material was returned to Earth by
the Apollo missions.
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Each Apollo lander left an experiment package
called ALSEP (Apollo lunar surface experiments
package).
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It monitored solar wind, measured interior heat
flow, and recorded seismic activity. The ALSEPs
were turned off in 1978 to save money.
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Green cheese moon (note the expiration date)
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Earth and Moon taken by Apollo 8
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