ellipse - A squished oval shape, the shape of the orbit of planets, Heliocentric - Sun-centered planetary system, Geocentric - Earth-centered planetary system, Orbital Velocity - The time it takes for a planet to move around the sun, equal to one year, Jovian - Gaseous or Outer planets, Terrestrial - Rocky or Inner planets, Rotation - Circular motion on ones own axis, Revolution - Circular/Elliptical motion around another object, Solar Nebular Theory - Explains that planets come from leftover nebula after a star is formed, Retrograde Motion - Movement that is opposite of the other planets, Meteor - "shooting star", a meteoroid burning up in the earth's atmosphere, Meteorite - A meteoroid that has struck the earth's surface,

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