Space puzzle

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Across
  1. 5. a smaller circular body of rock that is a small version of a planet
  2. 7. a system of planets revolving around a star
  3. 8. an instrument used to make distant objects look closer
  4. 10. what happens wen a star collapses after running out of fuel
  5. 12. an artificial machine that orbits the earth
Down
  1. 1. a gravitational field so intense that no matter or radiation can escape
  2. 2. a large circular celestial body with a crust and a gravitational force. can be a gas giant.
  3. 3. A large or small chunk of rock in space
  4. 4. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure
  5. 6. Where stars are born and also a remnant of supernova
  6. 9. a massive celestial body of gas that immensely hot
  7. 11. a system of millions of stars held together with gravitational attraction