Planets, moons and other objects and the origins of their names.
Minor Members Things that didn’t make up planets or moons.
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Transcript of Minor Members Things that didn’t make up planets or moons.
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Minor Members
Things that didn’t make up planets or
moons.
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Asteroids• Rocky objects usually larger
than a mile across.• Most are found in the Asteroid
Belt between Mars and Jupiter• Earth has been hit by asteroids
in the past.
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Comets• Are mostly made of ice.• Orbit the sun.• Their return can be predicted.• Their tail shows the direction of the
sun, not which way they are headed.
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Meteoroids• Small (less than 1 mile) rocks in
space.• When they enter a planets
atmosphere they are meteors.• When they strike the ground, they
are meteorites.
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We Have Been Hit• The moon shows it’s record of
impacts because it has no erosion.
• Earth shows only recent signs of impact.
• One major theory says that we were hit 65 MYA and this killed the dinosaurs.
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Iridium• Iridium is very rare here on
Earth but plentiful in asteroids.
• A layer of Iridium is found at the K-T boundary (65 MYA)
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