1. Chapter 3 Stars & Galaxies

2. What is a huge collection of stars called? galaxy

3. What is the sum of absolutely everything that exists? The universe

4. How is the universe changing all the time? It is constantly expanding & things are moving away from one another.

5. What is the name of a cool, dark, dead star? Black dwarf

6. What is the measure of how bright a star appears to be called? Apparent magnitude

7. The explosion of a star is called a __________. supernova

8. What kind of gas gives stars their energy? hydrogen

9. Name the three kinds of galaxies. Elliptical, spiral, irregular

10. What is the name of our galaxy? The Milky Way

11. What kind of galaxy is the Milky Way? spiral

12. What is the most common type of galaxy? elliptical

13. Which color stars are the hottest? Which are the coolest? Blue stars are hottest Red stars are coolest

14. When a massive stars dies, which two things can it become? Black hole OR neutron star

15. What is the first stage in the life cycle of alll stars? nebula

16. The distance that light travels in a year is called a _____________. Light year

17. What is the amount of light a star truly gives off called? Absolute magnitude

18. Who discovered that galaxies could be classified into three basic groups? Edwin Hubble

19. How does a star get its energy? Nuclear reactions in the center of the star

20. What determines a star’s color? The temperature

21. What is a region in space where the gravitational pull is so strong that not even light can escape it called? Black hole

22. How does our star (the Sun) compare to other stars in size? It is quite small when compared to other stars such as Betelguese

23. What is a collapsed red giant that shines dimly called? White dwarf

24. What is the dense remains of a star’s core after a supernova explosion called? Neutron star

25. The light that we see from our Sun left there how long ago? About 8 minutes

26. Good Luck Good Luck