Week 4, clip 10

Timepoint:  03:51.6

1) What kind of star has a very low temperature (~3000 kelvin) and a very high luminosity (~100 L_Sun)?

- Main Sequence O star
- White Dwarf
- Main Sequence K star
- Red Giant

Answers:
1) Red Giant

Explanation:
Red giants are cool stars with a very large radius, which gives them a large luminosity as well.  They are in the upper right of the Hertzsprung-Russell diagram.