Comets and Asteroids by Michael D. Cole

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Across
  1. 5. The frozen part of a comet that is made of ice and dust
  2. 6. A spherical envelope surrounding our solar system that lies beyond the orbit of Pluto
  3. 7. wind A constant outward flow of particles from the Sun
  4. 8. An icy rock in space
  5. 10. The force that attracts a body toward the center of any object with mass
Down
  1. 1. A trail of particles behind a comet that is swept away by solar wind
  2. 2. A rock in space
  3. 3. The tail of dust particles that streams from a comet as it comes closer to the sun
  4. 4. Ring of comets beyond the orbit of Neptune
  5. 9. Elliptic path of an object in space that is affected by gravity