PhySci

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