Earth Science Astronomy and space science

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Across
  1. 5. walked on the moon in 1968
  2. 9. object that revolves around another object in an orbit
  3. 11. this type of magnitude measures the amount of light received on Earth
  4. 15. The Milky way is this type of galaxy
  5. 20. A star system has at least ____ stars
  6. 21. surface is frozen nitrogen
  7. 22. a large cloud of contracting gas and dust
  8. 23. built by 16 nations and has been manned every day since 2000
  9. 25. most galaxies are moving away from each other, which means the universe is ____.
  10. 26. known as the red planet
  11. 27. has at least 60 moons
  12. 29. Earth is thought to be the center of the solar system in this model
  13. 30. astronimical units
Down
  1. 1. during these phases more of the moon's near side is lit each night
  2. 2. this type of magnitude measures the amount of light a star gives off
  3. 3. a huge group of stars, systems, clusters, dust and gas
  4. 4. A path around the sun
  5. 6. one complete revolution of Earth around the sun takes this long
  6. 7. A star is ____ when nuclear fusion starts
  7. 8. dark flat areas on the moon formed from lava 3-5 billion years ago
  8. 10. when Earth or the moon cast a shadow on the other
  9. 12. the different forms the moon takes in its appearance from Earth
  10. 13. at the end of a mission the shuttle can return to Earth and land like a ___.
  11. 14. when Earth is not leaning toward or away from the sun
  12. 16. during these phases less of the illuminated half of a moon is visible
  13. 17. ususually come from comets and astroids
  14. 18. day and night are causd by Earth's _____ on its axis
  15. 19. all objets are attracted to each other by the force of ___
  16. 24. First planet closest to the sun
  17. 28. the Earth's motion around the sun causes the ____ to change