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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