The Astronomy Center has provided educational resources to introductory astronomy educators since 2003. Over the past 20 years, the rapid pace of discovery has rendered some of our linked resources obsolete. Thus, the Astronomy Center will be decommissioned on March 1, 2022. Our highest quality resources will be retained on ComPADRE.org.
This site lists links to information on the planets, their satellites, and their rings, as well as to tables comparing the planets. Information includes facts like mass and volume, to equatorial/polar radii, ellipticity, escape velocity, geometric/bond albedo, orbital parameters, atmospheric composition, and much more.
%0 Electronic Source %A Williams, David %T Planetary Fact Sheets %V 2026 %N 6 March 2026 %9 text/html %U https://nssdc.gsfc.nasa.gov/planetary/planetfact.html
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