Describes the differences between red giant stars and white dwarf stars, and when a star becomes a red giant or a white dwarf.
Reviews characteristics of red giants and white dwarfs.
Scientists say that future humans could use passing asteroids to catapult Earth further from the Sun before it becomes too hot for us to live.
Hertzsprung-Russell diagrams are plots of 22,000 stars for luminosity versus color. Ninety percent of the stars are main sequence stars.