SPACE

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Across
  1. 2. name of locations in a two body orbit of relative gravitational stability
  2. 4. the surface of a black hole
  3. 5. the structure of Earth's core
  4. 7. created three laws of planetary motions
  5. 8. the director of 2001:A Space Odyssey
  6. 9. the period of earth's revolution around the sun
  7. 13. all planetary orbits form this shape
  8. 14. when a star in the sky has brightness that varies over time
  9. 16. a satellite that orbits Earth every 24 hours
  10. 18. determined the "G" constant
  11. 20. unable to escape from black holes
Down
  1. 1. a comet that is seen every ~76-80 years
  2. 3. a satellite that can be seen in the same location in the sky at all times
  3. 5. a comet with a very long period, last seen in 1997-1998
  4. 6. the radius of a black hole
  5. 10. an astronomical object that Bruce Willis blew up in 1998
  6. 11. created three laws of motion
  7. 12. comets were used in lecture to describe which of kepler's laws
  8. 15. the primary constituent of comets
  9. 17. an object that orbits the Earth at an altitude of 400km
  10. 19. the period of earth's rotation upon its axis