The Stars

4. When a white dwarf loses all of it's energy and stops emitting light it has reached the ______ ______ stage.
7. stars which are 1000 times bigger than sun.
9. a cloud of gas formed from helium to carbon that surrounds a red giant.
13. used in astronomy to investigate and measure the spectra produced by matter interacting with or emitting electromagnetic radiation.
15. the temperature at or near the surface of an object
16. true brightness no matter it's distance from Earth.
17. a massive swirling cloud in the earliest stage of a star’s life.
18. The smallest known stars.
19. When a main sequence star runs out of hydrogen fuel to burn, it may expand to a ___ ______.
21. Massive stars burn their fuel ________ than small stars so they have shorter life spans.
23. Once a star's heat energy has "turned on" and becomes stable,it becomes a ____ _________ ___.
24. massive clouds of dust and gas in space.
25. neutron stars that emit radio waves in pulses due to their spinning motions.

1. a place in space where gravity pulls so much that even light cannot get out.
2. stars with diameters bigger than the orbit of Mars.
3. Sun is classified as a _________ dwarf star, though it is bigger than the size of a white dwarf star.
5. a _______ dwarf is a star that has a diameter that is almost similar to the size of Earth.
6. diagram shows the relationship between surface temperature and absolute brightness of stars.
8. in the whilte dwarf stage,a star's matter is extremely ______.
10. star’s brightness as seen from Earth.
11. the time a star burns for and the span of their life cycle depend on it's ______.
12. Stars that are bigger than the giant stars.
14. the amount of light a star radiates
20. a powerful explosion resulting from nuclear fusion stopping in a supergiant star.
22. Smaller stars will last for several ________ years.