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This Concept Map, created with IHMC CmapTools, has information related to: Concept Map of the Universe (Semester Extra Credit), Red Shift means moving away, Gravity is an attraction between two objects, the outer planets such as Neptune, Universe studied by astronomers, an astronomical unit is the distance between Earth, the Big Bang occured about 13.7 billion years ago, the outer planets such as Jupiter, Spiral consist of a rotating disc, Galaxies made of stars, astronomers used trigonometry, a theory is a well supported explanation, Milky Way contains solar system, Hubble's Law suggests All stars are moving away, Red Shift from Doppler's effect, Galaxies can be Spiral, Planets include the outer planets, Spiral contains dust, Spiral contains stars, Elliptical is in ellipsoidal shape, the inner planets such as Earth