PhySci

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Across
  1. 5. Central part of an atom containing protons
  2. 7. Another name for a helium nucleus
  3. 9. Creation of new atomic nuclei
  4. 14. Ultra-dense star remnant of a supernova
  5. 18. Philosopher who coined the term atomos
  6. 20. Isotope of hydrogen with two neutrons
  7. 22. Second most abundant element
  8. 24. Giant cloud of gas where stars are born
  9. 25. Theory that matter is continuous
  10. 26. Aristotles fifth element
  11. 27. Alchemical liquid for immortality
  12. 29. Element produced by three helium atoms
Down
  1. 1. Ancient alchemical name for mercury
  2. 2. Mythical stone sought by alchemists
  3. 3. Explosive death of a massive star
  4. 4. Final stage of a Sun-like star
  5. 6. The state of the universe at time zero
  6. 8. Physicist who was secretly an alchemist
  7. 10. Heaviest element made by fusion in cores
  8. 11. Changing one metal into another
  9. 12. Isotope with one proton and one neutron
  10. 13. Most abundant element in the universe
  11. 15. Alchemical process to purify liquids
  12. 16. Theory of the universe's origin
  13. 17. Primary process that powers stars
  14. 19. Greek element associated with heat
  15. 21. A young star before fusion begins
  16. 23. Lightest solid element formed in the Big Bang
  17. 28. Force that causes a nebula to collapse
  18. 29. Radiation echo of the Big Bang