Crossword of Space

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Across
  1. 2. small things that make up everything,
  2. 4. star blue hypergiant star,
  3. 7. natural satellite of earth,
  4. 11. A a black hole in the middle of our galaxy,
  5. 13. is an elementary particle and a fundamental constituent of matter,
  6. 15. is one of the constellations of the zodiac,It's name is Latin,
  7. 16. a person who explores space,
Down
  1. 1. force that pulls everything to each other,
  2. 3. is a powerful and luminous explosion of a star,
  3. 5. a group of stars,
  4. 6. a huge collection of gas, dust, and billions of stars and their solar systems,
  5. 8. dipper famous constellation,
  6. 9. rocky, airless remnants left over from the early formation of our solar system,
  7. 10. the tiniest black hole known to exist and the one that is nearest to our solar system in the Milky Way galaxy
  8. 12. combining of atoms,
  9. 14. a famous dwarf planet,