Space crossword

123456789
Across
  1. 4. Come in shapes and sizes including spiral, elliptical or irregular. they are constantly moving away from each other.
  2. 5. region in space if infinite density where gravity is so strong that nothing, not even light can escape from it.
  3. 7. The smallest planet within our solar system.
  4. 9. The distance that light travels in one year
Down
  1. 1. The explosive death of a star.
  2. 2. A reaction in which two lighter atomic nuclei fuse, releasing energy.
  3. 3. A cloud of gas and dust in space.
  4. 6. The actual brightness of a star, measured using the absolute magnitude Scale.
  5. 8. Large balls of gas that undergo nuclear fusion.