The Earth, Moon, and Sun

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Across
  1. 4. an instrument used to study far away things such as the moon, stars, and other planets
  2. 5. the largest part of the moons shadow
  3. 6. a device that expels gas in one direction to move the opposite direction
  4. 7. a tide with the lowest difference between the high and low tides
  5. 11. the imaginary line that passes through Earth; Earth tilts on this
  6. 13. chunks of rock or dust from space
  7. 15. the eclipses that occurs when the moon is between the Earth and the sun
  8. 18. the amount of matter in an object
  9. 21. the force that propels a rocket forward
  10. 24. states that objects at rest will stay at rest and objects in motion will stay in motion
  11. 29. the speed a rocket must achieve to go beyond a planets gravitational pull
  12. 30. a spacecraft that can carry a crew into space
  13. 32. the very darkest part of the moons shadow
  14. 33. the study of all objects in space
  15. 34. the days when the sun is farthest north or south from the equator
  16. 36. the tendency of an object to resist a change in motion
  17. 37. the days when neither hemisphere is tilted toward or away from the sun
Down
  1. 1. large, round pits in the moon
  2. 2. the eclipses that occurs when the Earth is between the moon and the sun
  3. 3. the movement of one object around another
  4. 8. speed a rocked must achieve to make an orbit around Earth
  5. 9. an artificial satellite that people can live and work on for long periods of time
  6. 10. small robots that spaceprobes carry that walk on the surface
  7. 12. speed in a given direction
  8. 14. a spacecraft that carries instruments to collect data, it doesn't carry people
  9. 16. the different shapes of the moon that people can see from Earth
  10. 17. the curved path of spacecraft around a star, planet, or moon; the Earth does this to the sun.
  11. 19. an object that revolves around another object in space
  12. 20. states that every object in the universe attracts every other object
  13. 22. a push or pull
  14. 23. this attracts all objects toward each other
  15. 25. the partial or total blocking of one object in space by another
  16. 26. a tide with the biggest difference between high and low tides
  17. 27. the spinning of Earth on its axis
  18. 28. the force of gravity on an object
  19. 31. the rise and fall of Earths oceans
  20. 35. the moons dark, flat areas