Links
Sky Maps
- Monthly Sky Maps from Skymaps.com
- Seeing the Space Station and other Satellites
Online Astronomy News
- The Calendar Sky - Customize your own astronomical and space calendar with predictions for your geographical location, with astronomical events (eclipses, planetary conjunctions, etc.), International Space Station passage, and much more.
- Sky & Telescope Magazine
- Universe Today
- Spaceflight Now -- Breaking Space Science News
Space Missions
- Cassini-Huygens mission to Saturn
- Hubble Space Telescope resources and images
- Mars Exploration rovers
- Mars Reconnaissance Orbiter (MRO)
Image Sources
- Astronomy Picture of the Day with archives
- Lunar Picture for the Day
Textbooks
- Astronomy textbook from open source Wikibooks - free books which can edited (added to or corrected) by other visitors to the Wikibooks website
Astronomy Software
- Astro software - Comprehensive listing of commercial, shareware, and freeware software that can be downloaded on the Internet from National Radio Astronomy Observatory. Intended mostly for radio astronomy, but general astronomy software is listed as well.
Alerts
- Spaceweather PHONE monthly service that will call you when any new space science or astronomy events (such as appearance of a new bright comet) occur.
Organizations
- AAVSO - American Association of Variable Star Observers - Information for observing and measuring the brightness curves of variable stars.
- Association of Lunar and Planetary Observers - Association of Lunar and Planetary Observers is one of the oldest amateur astronomy organizations; learn all about viewing and doing serious scientific research on solar system objects (planets, the Sun, asteroids, comets, etc.)
- Astronomical League - Confederation of U.S. astronomical societies inviting you to browse their information on astronomy and astronomical societies