astronomy

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Across
  1. 2. It must orbit a star. It must be big enough to have enough gravity to force it into a spherical shape. It must be big enough that its gravity cleared away any other objects of similar size near its orbit around the Sun.
  2. 3. to get less and less, or to decline.
  3. 7. moving around itself
  4. 9. longest and shortest day of the year
  5. 10. spring summer winter and fall
  6. 13. lean
  7. 14. a curved path
  8. 15. mix of gasses that surround a planet
Down
  1. 1. a force that attracts things
  2. 3. a moon that gets more sunlight on it as the days go by
  3. 4. is any moon that appears more than half-lighted but less than full
  4. 5. the shape of a moon that is less than half-illuminated
  5. 6. day night equal length
  6. 8. very long-period waves that move through the ocean in response to the forces created by the moon
  7. 11. an oval
  8. 12. any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources.