Chapter three crossword puzzle

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Across
  1. 2. British scientist and astronomer
  2. 3. Scottish chemist found helium in the mineral uraninite and verified that that it had the same spectrum as the element Lockyer observed on the Sun
  3. 6. who rode his golden chariot across the sky daily and disappeared beneath the waves at night
  4. 8. grew up around the sun
  5. 9. built over a period of 1500 years by three separate cultures
  6. 10. giver of light, warmth, and life
  7. 11. discovered on the Sun before it was found on Earth
  8. 14. the nuclei fuse directly in
  9. 15. spent a great deal of time trying to understand the nature of the Sun
  10. 16. showed that the pathway proposed by Bethe actually did not occur to a significant extent in the Sun's core
  11. 18. keeps the stars volume fairly constant
  12. 19. reveal that the Sun is made up of hydrogen and helium with the remainder being only a smattering of other elements
Down
  1. 1. amount of radiant energy reaching the Earth's atmosphere per unit area per second
  2. 2. the nuclei of hydrogen atoms begin to join or fuse together to form the nuclei of heavier elements
  3. 4. German-American physicist, Nobel Prize winner
  4. 5. proposed that the Sun was powered by the conversion of gravitational energy into heat as it collapsed upon itself under its own weight
  5. 7. a fusion reactor that is stabilized by gravity
  6. 12. described as pretty much as the Greek's Helios
  7. 13. causes heat and pressure to build up
  8. 17. a Greek philosopher born about 500BC