NASA CROSSWORD

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Across
  1. 5. The streak of light caused when a meteoroid enters a planet’s atmosphere
  2. 7. The smallest unit of a substance that still acts like the main substance
  3. 9. A cloud of dust or gas found between stars
  4. 10. Large natural objects that orbit, or travel around stars
  5. 13. a huge collection of gas, dust, and billions of stars
  6. 14. all of space and matter of energy
  7. 16. The basic building block of matter
  8. 17. The stuff that everything is made of
Down
  1. 1. a place in space where gravity pulls so much that even light can not get out
  2. 2. A group of stars in the sky
  3. 3. small, rocky objects that orbit the Sun
  4. 4. An icy rock that lets off gas and dust
  5. 6. A force that pulls matter together
  6. 8. The explosion of a star that makes it as bright as a whole galaxy.
  7. 11. A large, bowl-shaped dent in the ground
  8. 12. An empty space that doesn't have any matter.
  9. 15. giant balls of hot gas