SPACE PUZZLES

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Across
  1. 1. A very luminous and distant active galactic nucleus
  2. 3. A cloud of gas and dust in space
  3. 4. The path of a celestial body around a star
  4. 6. A system of millions or billions of stars
  5. 8. A small rocky body orbiting the sun
  6. 9. A celestial body moving in an elliptical orbit
  7. 10. An icy body that releases gas and dust
Down
  1. 2. A stellar explosion that briefly outshines an entire galaxy
  2. 5. An instrument for observing distant objects
  3. 7. An artificial body placed in orbit around the earth