Space Crossword Puzzle (For a two word word I put a dash instead of a space.)

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Across
  1. 3. There is one in every solar system.
  2. 4. Made of ice and snow similar to an asteroid there's one whose name has Haley in it.
  3. 7. A big cloud of gas and dust sometimes thrown out by the explosion of a dying star. It will feed and give life to more stars in the future.
  4. 8. When there is a supernova what's left is usually either this or a black hole.
  5. 9. There are 8 in the Solar System. Some are rocky others are gassy.
  6. 11. Scientists still aren't totally sure about it but supposedly this is created when 2 neutron stars collide.
  7. 12. Orbits a planet, we have one.
Down
  1. 1. A type of planet but smaller. (Micky Mouse's dog.)
  2. 2. In the center of every galaxy. "Eats" a lot.
  3. 3. This is what happens when a big star reaches the end of its life and explodes.
  4. 5. This is created when a huge amount of stuff falls into the accretion disk of a supermassive black hole all the particles make a huge amount of friction and eventually shoot out the north and south poles of the black hole in a big burst of electromagnetic radiation.
  5. 6. The Milky Way _____ or the Andromeda _____.
  6. 10. Made of rock floats around in space there is the ______ Belt in our solar system.