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Student Name _____________________________________________ Date_____________________________ The AMAZING Solar System! Today Our Solar System Consists of … Our Sun! The Center of our Solar System! Eight planets that orbit the sun Three dwarf planets that also orbit the sun Over 150 moons that orbit the planets Countless asteroids, many in the asteroid belt Icy comets in highly elliptical orbits An “Astronomical Unit” is a convenient way to measure distances in the solar system. It is the average distance from the earth to the sun, about 150 million kilometers (93 million miles) In 2006, the “International Astronomical Union” (IAU) met in Europe and created a new class of heavenly body, the dwarf planet. It included three objects in this new category Ceres, the largest asteroid in the asteroid belt Pluto, traditionally the ninth planet Eris, discovered in 2005 and is larger than Pluto The “Revolution Period” is the time is takes for the object to orbit the sun. Planet/Dwarf Planet Mercury Venus Earth Mars Ceres (Asteroid Belt) Jupiter Saturn Uranus Neptune Pluto (Dwarf Planet) Eris (Dwarf Planet) Distance in AU .4 AU .7 AU 1.0 AU 1.5 AU 2.8 AU 5.2 AU 9.5 AU 20.0 AU 30.0 AU 40.0 AU 50.0 AU Revolution Period .2 Year .6 Year 1.0 Year 1.9 Years 4.6 Years 11.9 Years 29.5 Years 84 Years 165 Years 248 Years 555 Years