science crossword

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Across
  1. 1. reflecting light
  2. 5. small dense star that is normally the size of a planet
  3. 6. Theory that describes how the universe is extended
  4. 8. unit of astronomical distance
  5. 9. a system with billion and millions of stars; made of ice and dust
  6. 10. measure of how bright an object is when viewed from standard distance
  7. 11. young star that is still gathering mass from a cloud of dust and gas
Down
  1. 2. explosion of a large star
  2. 3. clearly visible
  3. 4. all existing matter and space considered as a whole
  4. 7. cloud of gas and dust in outer space