NASA Jet Propulsion Laboratory - Great site for finding out about current space missions. There is news, a calendar, missions to learn more about the solar system, and a site for kids.
Kepler - A mission to search for habitable planets.
NASA Spacesuits - Learn why spacesuits are very important, and look at the suits that NASA hos used.
Cape Cosmos - Here you find out about the role that women and African Americans played in the space program, and about the difficulties which they faced in finding equal opportunities. The story is told by astronaut Mae Jemison.
The Astonomy Workshop - Java applets are used to let you
view rotation of planets and moons. You can also calculate orbits and the time it will take to travel to planets.
The Web Nebulae - Pictures of galaxies, clusters, and nebulae.
Astronomy Basics- How to get started observing the stars
from Astonomy magazine.
At Home Astronomy - Hands-on astronomy experiments for the whole family. The site is by the Space Sciences Laboratory at the University of California, Berkeley.