chapter 21 crossword

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Across
  1. 3. millions of small rocks objects that orbit the sun
  2. 8. planets closest to the sun
  3. 10. made up of gas and dust and orbits the sun
Down
  1. 1. used to measure the distance from earth to space
  2. 2. an objects journey around the sun
  3. 4. largest object in the solar system
  4. 5. when a planets atmosphere traps solar energy
  5. 6. the time an object takes to complete one rotation
  6. 7. closest planet to the sun
  7. 9. nearly spherical