The Life of Stars

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Across
  1. 4. elements oxygen, nitrogen, and _____ are formed in massive stars when carbon atoms get pulled due to temperature increase
  2. 6. throughout this phase, hydrogen in outer parts carries on burning and center gets hotter and hotter
  3. 10. the result when star more massive than the sun remains massive after supernova and has no nuclear fusion supporting the core and collapse by its own gravity
  4. 12. coined the word 'black hole'
  5. 14. occurs in the center of the cloud and begins to glow brightly once temperature reaches 15,000,000°C
  6. 15. estimated number of stars in the universe
  7. 17. how a star will react in the red giant phases should depend on ____
  8. 19. a cold, dark star produced when white dwarf has been exhausted after it will no longer emit light
  9. 21. as stars glow during nuclear fusion, hydrogen changes to ____
  10. 22. it drags the gas in nebula together
  11. 23. it is what becomes when massive star's core, which is 1.5 to 4 times massive as the sun, remains after becoming a supernova
  12. 24. this make a nebula have a stronger gravitational pull
  13. 25. the first black hole discovered
  14. 26. a huge explosion which contains tremendous amount of energy and can have a temperature up to 1,000,000°C
Down
  1. 1. a kind of star which rises from nuclear fusion once it stabilizes at 15,000,000°C and contracts slightly
  2. 2. when such star collapse, planetary nebula is created and can be used as building material for planets in developing solar systems
  3. 3. what is called when neutron star starts to spin often emits radio waver and occur in pulses
  4. 5. it is where a star is born
  5. 7. a ring around the core of the star formed from the remains of exploded hydrogen
  6. 8. it is formed when helium fuse upon reaching 200,000°C
  7. 9. the kind of star which dies once final helium atoms fused into carbon atoms
  8. 11. the kind of star produced from dead medium-sized stars wherein gravitational pull leads to the loss of the star's matter collapsing inwards and compacting to become extremely dense
  9. 13. the element which constitutes mostly on the outer parts of the star
  10. 16. type and _____ influenced how each star is formed
  11. 18. the color which glow when stars' outer parts expand and cool
  12. 20. black holes were known before ad ______