Astronomical Picture of the Day - NASA's Picture of the Day, every day|
CNN Space Science - Superb source for space related news and events and education.
Hubble Space Telescope - Space Telescope Science Institute, Hubble Space Telescope, news and Latest pics.
Mars Exploration - NASA Mars Exploration and rover sites.
NASA - National Aeronautics and Space Administration
NASA: Live TV/Audio - Live shuttle and space coverage streaming tv/video/audio of NASA events
NASA: Cams/Video - Live cams, video, information and photos, live.
NASA: Earth from Space - Space and satellite images and photos of earth, cities, features, regions and more!
NASA: Live Satellite Tracking - Excellent LIVE JAVA Satellite tracking + weather. Track satellites and weather all over the world!
NASA: 3D Live Satellite Tracking - Advanced 3D LIVE JAVA Satellite tracking + weather.
NASA: World Wind Earth Browser - Superb viewing/browsing software with satellite imagery and mapping of Earth.
SolarMonitor - Current and archived information about solar activity and events
AAS - American Astronomical Society
International Space Station - CNN's excellent interactive Station resource.
NRAO - National Radio Astronomy Observatory
NSSDC - National Space Science Data Center, photos and space information resources
SDAC - Solar Data Analysis Center
SWPC - Space Weather Prediction Center from NOAA.
SETI at home - Participate in the search for extraterrestrial life.
SIRTF - Space Satellite resources
Planetary.org - Superb source of current space related events and coverage.