| 1 | Astronomy.com | |
| | provides news and feature stories from Astronomy magazine as well as observing guides, an image gallery, parent and teacher resources, a beginners section, and more.
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| 2 | Astronomy Picture of the Day (APOD) | |
| | discover the cosmos! Each day there is a different image or photograph of our fascinating universe, along with a brief explanation written by a professional astronomer.
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| 3 | AstroWeb: Astronomy/Astrophysics on the Internet | |
| | searchable directory of astronomy-related information.
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| 4 | Bad Astronomy | |
| | righting wrong ideas.
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| 5 | Eric Weisstein's World of Astronomy | |
| | addresses the atmosphere, calendars, galactic and observational astronomy, remote sensing, the solar system, and the stars.
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| 6 | Sky & Telescope | |
| | monthly magazine containing sky maps, astrophotos, and observation tips for sky-gazers of all levels.
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| 7 | Astronomiae Historia/History of Astronomy | |
| | features sites dedicated to the history of the science.
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| 8 | SkyView | |
| | virtual observatory dynamically generating images of the sky in different wavelength regimes from a static image database, intended as a quick look facility to see the heavens.
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| 9 | Views of the Solar System | |
| | solar system learning guide for people of all ages.
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| 10 | A Practical Guide to Astronomy | |
| | resource for both the beginner and the experienced backyard astronomer, with the latest facts and photos.
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