The Secret Life of Gold

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Across
  1. 3. substance made up of various types of particles that occupies physical space and has inertia
  2. 7. formed when a massive star runs out of fuel and collapses
  3. 8. rocky objects that orbit the sun
  4. 13. a subatomic particle with the same mass as an electron
  5. 14. particles consisting of two protons and two neutrons tightly bound together
  6. 16. ball of hot gas
  7. 18. unzipped the universe 13.8 billion years ago
  8. 20. when two stars orbit around a common center of mass
Down
  1. 1. dust that occurs in outerspace
  2. 2. smaller version of an asteroid
  3. 4. when two light atomic nuclei combine two form one heavy one
  4. 5. measure of the fineness of gold
  5. 6. a disturbance that moves faster than the local sound of speed
  6. 9. the explosion of a star
  7. 10. dramatically changed the development of stars
  8. 11. where gold is mined today
  9. 12. the force by which a planet pulls objects towards its center
  10. 15. huge collection of stars, dust, and gases
  11. 17. the zone above and around our planet
  12. 19. formed by clouds of neutrons smashing into each other