Earth, Moon, Sun and the Solar System

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Across
  1. 4. This is an average sized star that is 4.6 billion years old
  2. 5. Ptolemy and _______ believed in an Earth-centered model
  3. 6. The Earth and moon both have this type of surface
  4. 7. The first scientist to believe a sun-centered model
  5. 9. Earth __________ around the sun to cause the seasons
  6. 11. This planet travels around the sun faster than all the others
  7. 13. Earth ______ to cause day and night
Down
  1. 1. How long it takes for the moon to revolve around the earth (two words)
  2. 2. The moon phase that comes after waxing crescent (two words)
  3. 3. The first scientist to use a telescope to study space
  4. 4. Earth's tilt on its axis causes and revolution causes -
  5. 8. The sister planet to Earth because they are similar in size
  6. 10. How long it takes for Earth to revolve around the sun (two words)
  7. 12. The only planet that has a constantly changing surface