Space Crossword

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Across
  1. 2. The regularly repeated elliptical course of a celestial object or spacecraft about a star or planet
  2. 5. A celestial body moving in an elliptical orbit round a star
  3. 6. The force that attracts a body towards the center of the earth, or towards any other physical body having mass
  4. 8. A space entirely devoid of matter
  5. 10. A strong gravitational force that light can not escape from
Down
  1. 1. A fixed luminous point in the night sky which is a large, remote incandescent body like the sun
  2. 3. A cylindrical projectile that can be propelled to a great height or distance
  3. 4. All existing matter and space considered as a whole; the cosmos
  4. 7. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  5. 9. The natural satellite of the earth, visible by reflected light from the sun