- Constructing an SF Universe - http://www.sff.net/people/SASwann/text/wb.htm
Excellent article by professional, published science fiction author, S. Andrew Swann.
- Planetary Fact Sheets - http://nssdc.gsfc.nasa.gov/planetary/planetfact.html
Extensive physical data describing the planets, satellites, and comets of our solar system, courtesy of NASA's National Space Science Data Center. Potentially useful to designers of science fiction settings and the detail-minded.
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