Astronomy
- Astronomy for Kids
- Astronomy Picture of the Day
- Smithsonian Astronomy Exploring the Heavens
- Hubble Telescope -- View the Universe
- Microsoft Research WorldWide Telescope -- View the Universe
- Google Sky -- View the Universe
- Nine Planets: A Multimedia Tour of the Solar System
- Star Child:A Learning Center for Young Astronomers
- Earth and Moon Viewer
- Wikisky.org
- Space.com
- View of the Earth from a Satellite
- Windows to the Universe
- Geography from Space
- Solar Images and auroral activity
- NASA Visible Earth
- Space Weather: What's Happening in Space Today