Compiled by the Staff of Sky’s the Limit
Astronomy Picture of the Day
This NASA site features a new picture and short article about astronomy and space exploration every day. Archives go back to 1995; you may search for your favorite topic.
NASA Kid’s Club
Lots of cool stuff for kids.
The Scale of the Universe 2
Shows the scale of the universe from smallest to largest. An awesome tool.
Seds Students for the Exploration and Development of Space
Hosted by the University of Arizona chapter chapter of SEDS at the Lunar and Planetary Laboratory. Be sure to check the NINE PLANETS SOLAR SYSTEM TOUR.
Stars by Jim Kaler, University of Illinois
This site, created by Professor Kaler, is updated every Friday with a description of a star and a preview of observational opportunities for the coming week. Be sure to browse the archived data on stars and constellations.
This site is maintained by the popular magazine and features current news, how to do it articles, and observational notes with star charts for the current month.
Sky & Telescope
This site is maintained by the other major popular magazine. It too features current news, how to do it articles, and observational notes with star charts for the current month.
Wilkinson Microwave Anistropy Probe
This is the site to visit to keep track of the BIG BANG. Data released in February of 2003 provides major support for the Big Bang, expanding, flat universe and more.
Ned Wright’s Frequently Asked Questions in Cosmology
Start with Professor Wright’s Frequently Asked Questions then browse the rest of his site for up to date information on astronomy and cosmology. You may also post a question on the site.
Chandra X-ray Center
This site reports activities of the Chandra X-Ray explorer and the contributions to astronomy and cosmology made by research focused on X-ray emissions from space.
SOHO Exploring the Sun
SOHO is a project of international cooperation between ESA (European Space Agency) and NASA that studies our sun.
Science at NASA
Keep up with mission progress and current events in space.
The Anglo-Australian Observatory
This organization, located at Siding Springs, Australia, provides excellent data about Earth’s southern hemisphere. The AAO also supports NASA missions.
U.S. Naval Observatory
Click on to the ASTRONOMICAL APPLICATIONS DEPARTMENT for the most complete almanac of celestial events.
A Caution about Web Sites!
These sites are favorites of many astronomers, both amateur and professional. If you visit them frequently you will find that when you cross-check data among them there is usually agreement.
In using material from the web, data posted by colleges and universities are most likely to be reliable. NASA sites are very good but some are directed at specific school grade levels and may disappoint some visitors.
An important caution in evaluating any site is the date it was last up-dated. Sites with extensive data that seems out of sync with other sources may well be two or three years old. New observations may well have negated the original findings.