Our solar system

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Across
  1. 2. a fundamental system in condensed matter sciences and the main constituent of gas giant planets
  2. 4. a large planet mostly composed of helium and/or hydrogen
  3. 5. a doughnut-shaped region of icy objects beyond the orbit of Neptune
  4. 6. a line of cliffs formed by the faulting or fracturing of the earth's crust
  5. 11. they have a compact, rocky surface like Earth's terra firma
  6. 12. Objects in space that range in size from dust grains to small asteroids
  7. 13. a rock that falls to Earth from space.
  8. 15. cosmic snowballs of frozen gases, rock, and dust that orbit the Sun
  9. 16. the distance from a star that allows liquid water to persist on its surface
  10. 17. apparent motion of a body in a direction opposite to that of the motions of most members of the solar system
Down
  1. 1. a torus-shaped region in the Solar System
  2. 3. a celestial body that -orbits the sun
  3. 7. the average distance between Earth and the Sun
  4. 8. a solid object arising during the accumulation of orbiting bodies
  5. 9. When meteoroids enter Earth's atmosphere
  6. 10. apparent motion of a body in a direction opposite to that of the (direct) motions of most members of the solar system
  7. 12. happens when Earth passes through the path of a comet.
  8. 14. a measure of how non-circular the orbit of a body is