Planets (7th Grade - Unit 10)

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Across
  1. 2. a celestial body moving in an elliptical orbit round a star.
  2. 4. evidence or argument establishing a fact or the truth of a statement.
  3. 5. travel through (an unfamiliar area) in order to learn about it.
  4. 8. an act of saving or being saved from danger or difficulty.
  5. 10. a brief and usually light fall of rain, hail, sleet, snow etc.
  6. 11. anything presented as proof of a thesis
  7. 13. the outside part or the top layer of something
  8. 14. the curved path of a celestial object
  9. 15. all existing matter and space considered as a whole
  10. 18. keeps everything on the ground
Down
  1. 1. a small body of matter from outer space that enters the earth's atmosphere
  2. 3. surrounds a planet
  3. 6. notice or perceive something
  4. 7. the natural satellite of the earth
  5. 9. a rocket-launched spacecraft able to land like an unpowered aircraft
  6. 12. gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter
  7. 16. the collection of eight planets and their moons in orbit round the sun
  8. 17. an artificial body placed in orbit round the earth or moon or another planet