American Institute of Physics
Don't know what's happening in physics? Visit the AIP website. This site has links to journals published by AIP and other information about what's happing in the world of physics.
The Mars Missions
Everything you ever wanted to know about Mars, and then some!
Not sure exactly what time it is? Check with the Atomic Clock!
Students for the Exploration and Development of Space
Are you interested in outer space? Are you a student? Go check it out!
NASA Home Page
The NASA home page provide a link to all NASA related sites. It also has a cool photo archive.