Outer space

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Across
  1. 2. The branch of learning that deals with the phenomena at the scale of many light-years
  2. 5. Emitting or reflecting light
  3. 9. An object that is sent into outer space to collect data
  4. 11. A unit of astronomical distance equivalent to the distance that light travels in one year
  5. 12. A celestial body moving in an elliptical orbit around a star
  6. 13. A small body of matter from outer space that enters the earth's atmosphere
  7. 14. The study of space
Down
  1. 1. Has a tail as it gets closer to the Sun
  2. 3. Our galaxy
  3. 4. A system of millions or billions of stars with gas and dust held together by gravity
  4. 6. All existing matter and space considered as a whole
  5. 7. The planet closest to the sun
  6. 8. The planet we live on
  7. 9. An astronomical object comprising a luminous spheroid of plasma held together by its gravity
  8. 10. The planet that is no longer part of our solar system
  9. 15. What the solar system orbits around