Stellar Evolution Review

2. Hot stars are typically brighter or more ____________ than cooler stars
4. over half of the stars in the night sky are in a ___________ system (they have a companion)
6. after hydrogen, the most common element in stars is
9. in order to fuse hydrogen into helium, the core of a star needs to reach 15 _______ Kelvin
10. this is the name of the stage of a star before it starts fusing hydrogen
12. fusing helium produces more ____________ than fusing hydrogen
13. type 2 supernovae that create black holes must start with a mass of _________________ times more than the Sun
15. type 1a supernovae require _________ star(s)
16. stars with more mass live much _________ lives than low mass stars
17. The energy of fusing in the core of stars is the only thing preventing a star from dying due to its own ______________
18. O type stars are typically what color?
20. the sun is categorized as this type of star
23. given a fixed volume, if pressure increases then ___________ increases
24. this type of supernova is the result of one star accreting mass from a companion
26. Given a fixed temperature, if pressure increases then _______________ decreases
28. a magnitude 2.5 star is ____________ than a magnitude 3.5 star
32. this area of the H-R Diagram is where most stars fall.
33. this type of star changes in brightness
34. In a massive star, it takes a single _____ to fuse all silicon into iron

1. Compared to other stars, the Sun is relatively _________ in size
3. this is the order of the letters for stellar classifications
5. Betelgeuse is this type of star (color and size)
7. this is the stage of a low mass star after the red giant phase
8. A blue star is typically ___________ than a red star
11. K type stars are typically what color?
14. this section of the Hertzsprung-Russell Diagram is below the main sequence
19. fusing iron (or in some cases, carbon) causes this to happen
21. the force that keeps white dwarfs from collapsing is called electron ___________ pressure which occurs because electrons don’t like being near each other
22. there are _________ high mass stars than there are low mass stars
25. a star will fuse helium much _____________ than hydrogen
27. The Sun will ends its life cycle as a white dwarf with carbon and _________ as the only remaining elements
28. there are about 200 ________ stars in the Milky Way
29. The Sun’s stellar classification is _______
30. type 2 supernovae require _________ star(s)
31. Supernovae are the only natural way that elements heavier than ______ are created