5. Dub set is here!

6. Starlight informs us about a stars: age, composition, distance, velocity & more. The universe is big and it is exp a n d i n g! Let’s study stars and their light…

7. Dust--in a nebula--is pulled together by gravity. When the mass and heat reach a critical point, Hydrogen fusion begins. The star is “born” and begins to emit light (radiation).

9. Which process produces the energy that allows the stars of the universe to radiate visible light? (1) convection (2) Insolation (3) nuclear fusion (4) radioactive decay

10. Stars live in a “tug-of-war” between fusion energy pushing out and gravity pulling in. When the hydrogen fuel runs out, what happens next depends on the star’s original mass.

11. Our sun is a small star. What happens when it runs out of hydrogen fuel to fuse?

12. Which star has about the same temperature as the sun, but is about 5000 times brighter (more luminous)? What is the temperature of a “main sequence” star with a luminosity of about 50?