Chemistry crossword

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Across
  1. 3. — The galaxy-forming clouds of cosmic dust and gases (4 letters).
  2. 5. Explosive events that create elements in stars (10 letters).
  3. 7. — The process by which elements are created in stars (12 letters).
  4. 8. — A light element formed in the Big Bang alongside hydrogen and helium (8 letters).
  5. 9. The event that marked the formation of the universe (3 words, 3, 4, 3).
  6. 10. — Explosive events that create elements in stars (10 letters).
Down
  1. 1. — One of the light elements formed during the Big Bang, used in batteries (7 letters).
  2. 2. The process by which elements are created in stars (12 letters).
  3. 4. The element formed alongside hydrogen and helium during the Big Bang (7 letters).
  4. 6. The most abundant element formed during the Big Bang (9 letters).