The Life of Stars

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