Astronomy Key Terms

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Across
  1. 2. In geocentrism, a secondary looping path that a planet makes, which explains retrograde motion
  2. 5. Moon more than half full
  3. 7. When the moon passes between the earth and the sun
  4. 11. When planets appear to loop backwards in their path over several weeks
  5. 13. Getting smaller (moon)
  6. 14. Moon less than half full
  7. 16. When a star moves away from us, its lightwaves get stretched out
Down
  1. 1. A theory of the cosmos with the earth stationary at the center, in which all other bodies orbit the earth
  2. 3. A natural satellite the orbits a planet, not a star
  3. 4. A force exerted by every object with mass on every other
  4. 6. When a star moves toward us, its lightwaves get compressed
  5. 8. When the earth passes between the moon and the sun
  6. 9. A theory of the cosmos with the sun at the center, orbited by earth and other planets
  7. 10. Getting larger (moon)
  8. 12. An body that has strong enough gravity to become a sphere, but is not a star
  9. 15. A self-luminous sphere held together by gravity which gives off radiation due to nuclear fusion