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