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  • A planet is any body in orbit around the Sun that has enough gravity to form a sphere and that has cleared the neighborhood near its orbit of smaller objects. The inner planets are mostly rock and metal. 8 5 1. Mercury 2. Venus 3. Earth 4. Mars 3 1 7 4 The Sun The outer planets are mostly gas and dust. 2 6 5. 6. 7. 8. Jupiter Saturn Uranus Neptune
  • The planets that are made of gas and dust are much bigger than the planets that are made of rock and metal. Jupiter Uranus Earth
  • Which of the following planets is mostly rock and metal? Saturn Uranus Mars
  • Saturn is made of gas and dust. Do you think it would be bigger or smaller than Mars? Bigger than Mars Smaller than Mars
  • Match each planet name to the diagram. Saturn Neptune Mercury Earth 8 5 3 1 7 4 2 6 Venus Jupiter Mars Uranus
  • What is Neptune mostly made out of? Metal and Rock Dust and Gas
  • Astronomers are planning to define a new type of planet. This new type is a “plutoid” or “dwarf planet.”  Plutoids are not big enough to clear their path of other objects.  Pluto is a plutoid. So are Ceres, Eris, Makemake, and Haumea. 
  • Pluto is in orbit around the sun, but it has a smaller object in its immediate neighborhood. Is it a planet? Yes No Yes, but it’s a dwarf planet