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Bad Astronomy (Phil Platt) Brian's Space Hotlist Discovery Dr. Matrix' Web World of Science Earth Impact Effects Program (simulates impacts of interplanetary objects with the Earth) Encyclopedia of Astrobiology, Astronomy, and Spaceflight, The Evolution Resources (Harvard University) Galacticsurf International Association of Astronomical Artists Live Science Lunar and Planetary Institute Lunar and Planetary Science at NSSDC PSIgate (Physical Sciences Information Gateway) Public Library of Science SciCentral SciNet Scirus (scientific web search) Science IQ Select Science Net Shade Tree Physics Space.com Spaceflight Now SpaceRef Tree of Life Project Understanding Evolution |