Space crossword

123456
Across
  1. 3. the study of stars, planets and other clestial objects
  2. 5. how a pen can fall to the ground
  3. 6. the third planet in our solar system
Down
  1. 1. the study of the movements and relative positions of celestial bodies
  2. 2. a mass in orbit around another mass
  3. 4. path a planets takes around a star