Autumn Jenree P1

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Across
  1. 4. when the planet's core cooled and shrank, causing the surface to crack.Planetesimal
  2. 5. The planets Mercury, Venus, Earth, and Mars, are called
  3. 7. large objects made of dust and ice that orbit the Sun.
  4. 8. Objects in space that range in size from dust grains to small asteroids
  5. 9. a fundamental system in condensed matter sciences and the main constituent of gas giant planets
  6. 11. a meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground
  7. 12. orbiting sphere that is not a planet
  8. 14. a region of the solar system beyond the orbit of Neptune
  9. 16. an illusion caused by the fact that objects in our solar system orbit the Sun at different distances and speeds
  10. 17. a circle that has been squashed or flattened a bit
Down
  1. 1. the mean distance between the center of the Earth and the center of the sun
  2. 2. Rocky debris creating colorful streaks of light
  3. 3. large planet mostly composed of helium and/or hydrogen
  4. 6. the habitable__
  5. 10. an area outside the four inner planet
  6. 13. how flat or round the shape of the ellipse is
  7. 15. appears as a streak of light