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