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"Astronomy 2"

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Words
4.6 billion years ago
asteroid
asteroid belt
atmosphere
centripetal force
closer
comet
decreases
dwarf planet
earth
elements
energy
float
gas giant planets
gravitational force
jupiter
kepler's first law
kepler's second law
kepler's third law
kuiper belt
mars
mass
mercury
meteor
meteoroid
neptune
oort cloud
orbit
saturn
sink
step 1 of solar system formation
step 2 of solar system formation
step 3 of solar system formation
step 4 of solar system formation
terrestrial planets
trillion
uranus
venus