The Universe

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Across
  1. 2. small incredibly dense ball of closely packed neutrons
  2. 5. gigantic explosion in which a high mass star throws its outer layer into space, but the core remains
  3. 6. the distance light travels in a year, make sure to include -
  4. 7. collection of large and small bodies that orbit one central star.
  5. 11. Spherical body that orbits a star.
  6. 12. measure of a stars brightness as seen from Earth
  7. 13. space and all the matter and energy in it
Down
  1. 1. large cloud of gas and dust
  2. 3. how bright a star would be if it were located at a standard distance
  3. 4. large collection of stars, gas, and dust that is held together by gravity
  4. 8. The star's actual brightness
  5. 9. hot dense core of matter that remains after the collapse of a low mass star
  6. 10. large celestial body that is composed of gas and emits light