Asteroids, Comets, and Pluto: The Small Pieces

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Across
  1. 5. The asteroid belt lies between the planets of Mars and _____________.
  2. 7. A comet has three main parts: the ___________________ , the coma, and the tail.
  3. 8. Billions of comets occur in the _______________________ , which lies beyond Pluto and the Kuiper Belt.
  4. 9. A comet's tail always points away from the ___________________ .
  5. 10. One theory about asteroids says that Jupiter's strong ____________________ prevented the asteroids from forming a planet.
Down
  1. 1. _____________________ is the process through which fragments in space are drawn together to form planets.
  2. 2. _____________ objects are like icy asteroids that share an orbit with Pluto.
  3. 3. Many scientists believe a strike by an asteroid 65 million years ago helped cause the extinction of ______________________ on Earth.
  4. 4. Another, more proper name, for a shooting star is ___________________ .
  5. 6. In size, ___________________ is the smallest of all planets.