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Asteroids, Meteoroids and Comets In: Other than the Sun, illustrate and describe celestial bodies in our solar system. 124(126) Asteroids • Orbit the Sun • Rocky and metallic objects too small to be considered planets • Known as minor planets Asteroids • The total mass of all the asteroids is less than that of the Moon. Meteoroids, Meteors, Meteorites • Meteor: • The streak of light produced as matter in the solar system falls into Earth's atmosphere • Caused by atmospheric friction Meteoroids, Meteors, Meteorites (Not a meteoroid, but a meteorite) • Meteoroid: • Rocky or metallic object in orbit around the Sun (or another star) • Too small to be called an asteroid or a comet Meteoroids, Meteors, Meteorites • Meteorite: • a meteoroid that reaches the surface of the Earth without being completely vaporized Meteoroids, Meteors, Meteorites • When a meteorite strikes, it can cause a crater. On Earth On Phobos, a Martian Moon Comets “Dirty Snowballs” • Orbit the sun • oddly shaped • lumps of ice and rock, often only a few miles across • from as far away as 100,000 AU Comets • As that ball of ice gets close enough to the Sun, its heat begins to melt some of the ice that makes up the comet. • The melted ice becomes a gaseous tail Comets • The tail ALWAYS points away from the sun Where do comets form? Where do comets form? Scale of the Universe • http://htwins.net/sc ale2/scale2.swf?bo rdercolor=white Asteroids, Meteoroids and Comets Out: Compare/Contrast: asteroid/meteoroid 124(126)