Sun, Earth and Moon Vocabulary

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Across
  1. 4. the path that one object in space follows as it revolves around another object in space
  2. 5. the combination of substances that make up a whole object
  3. 6. the spinning of a planet, Moon, or other object on its axis
  4. 7. imaginary line about which an object rotates
  5. 9. a giant ball of gases that is the source of energy for the Earth
  6. 10. the planet we live on
  7. 12. the earth rotates in this direction
  8. 15. the sun is made of ________ , mostly helium and hydrogen
Down
  1. 1. When the sun appears to come up in the east, we call this a __________
  2. 2. the air that surrounds the Earth; it is made of a mixture of gases
  3. 3. one orbit of an object, such as a planet or satellite, in space around another object in space
  4. 8. a large cavity on the surface of the moon
  5. 11. 50 of these can fit in the Earth
  6. 13. When the sun appears to disappear below the horizon line in the west, we call this a _________.
  7. 14. one full rotation of the Earth takes one _____ , or 24 hours