Other
Sky Server: Scavenger Hunt
In this site, from the SkyServer of the Sloan Digital Sky Survey users hunt for stars, galaxies, quasars, asteroids and meteors. Learn what they look like and how to find them.
Other
Sky Server: Color
SkyServer answers why stars have different colors and shows what you can learn by studying the colors of stars, galaxies, and other objects.
Globio
Glossopedia: Stars
Many of the objects you can see in the night sky are stars, large objects in space that produce light. Our galaxy, the Milky Way, contains more than 100 billion stars. Stars are so far away that their light does not reach us for years....