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Learn about planets, measure distances in Astronomical Units (AU) - 1 AU = 93 million miles, planetary elliptical orbits, Perihelion & Aphelion. Dive into the wonders of our celestial neighborhood!
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1. The Planets
2. Discussing Planets Measure distances to planets in Astronomical Units (AU). 1 AU = distance from Earth to the Sun = 93 million miles. Planets orbit elliptically around sun. Perihelion: point closest to the sun Aphelion: point farthest from the sun.