The absolute best sites on hard science and mathematics that the Web has to offer.
sci.astro FAQ  The FAQ for the astronomy Usenet newsgroup. Ask the Space Scientist  See an astronomer's answers about his trade. Handbook of Space Astronomy and Astrophysics  An indispensible handbook [GIF format]. Planetary Fact Sheets  You can't do without this if you need Solar System data. The Nine Planets  Welcome to the Solar System. Here's your grand tour. Internet Stellar Database  An extensive online queryable database of nearby stars. SolStation.com  Data on nearby stars, and Java visualizations of starmaps and orbits. Cosmology Tutorial  Cosmology. Big Bang. You know, that stuff. Olbers' Paradox  Why is the sky dark at night? This isn't as simple a question as it sounds. Bad Astronomy  Everything bad you ever wanted to know about astronomy. Ask the High Energy Astronomer  "High energy" means the really neat stuff. Apollo Lunar Surface Journal  Everything that happened on the surface of the Moon. Everything. Ask an Astronomer  Curious about astronomy? Ask an astronomer. Astronomy Picture of the Day  Every day, see a new picture of the Universe! NearEarth Object Program  NASA's NEO page, with comprehensive information and tables. Current Impact Risks  A frequently updated list of the currently known NEO impact risks. 
World of Richard Dawkins  An unofficial Web page on Richard Dawkins' works. Criticality and Radiation Accidents  The road to discovery is not always an easy one. Human Body in a Vacuum  What does happen when a human gets spaced? Cosmic Ancestry  Did life on Earth come from somewhere else? Health Physics Society: Ask the Experts  Have a radiation safety question? 
WebElements Periodic Table  The best periodic table on the Web, hands down. Chemical Elements.com  An online, interactive periodic table of the elements. A Periodic Table of the Elements  A resource provided by Los Alamos National Laboratory, aimed more toward high school level. 
Yahoo! Maps  Yahoo! Maps is arguably the best online maps resource on the Web. 
WorldWide Earthquake Locator  Find recent earthquakes everywhere on the planet  as advertised. 
sci.math FAQ  The valuable Usenet FAQ on mathematics. World of Mathematics  You won't find a mathematics reference better than this. Ask Dr. Math  Maths questions answered cheap (well, free). Common Errors in Undergraduate Mathematics  What mistakes do maths students make the most? Integrator  Use Mathematica remotely to calculate antiderivatives. Fallacies  You're on the road to truth. Don't stumble. Prime Pages  There's more to prime numbers than meets the eye. Links to Pi Pages  Pi is likely the most famous mathematical constant. But why? Geometric Calculus Research and Development  All about geometric algebras and calculus. 
sci.physics FAQ  Perhaps one of the most direct and forthright FAQs on Usenet. Mathematical Physics  John Baez' outstanding updated resource of what's going on. Entropy  The clockwork universe is running down. But why? LANL ePrint Archive  This archive is the raw, unadulterated stuff. Proceed with caution. International System of Units (SI)  We're way beyond the mere metric system, people. Particle Data Group  The authority on particle physics data worldwide. Particle Adventure  The Universe is a sea of subatomic particles. Better get used to them. Relativity on the Web  Relativity, Web. Web, relativity. Behave. Black Holes FAQ  Have some questions about black holes? Here are your answers. Falling Into a Black Hole  What would it look like falling into a black hole? Relativity and FTL Travel  What is it with relativity and fasterthanlight travel, anyway? Cosmological Fads and Fallacies  Ned Wright's excellent summary of "Errors in some popular attacks on the Big Bang." 
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