Astronomy & Physics

• Space.com
• Space reference
• Encyclopedia Astronautica
• Universe Today
• Virtual Trips to Black Holes & Neutron Stars
• Black Holes
• Mega black hole could devour the sun
• The Extrasolar Planets Encyclopedia
• Exoplanets Exploration
• The Messier Catalog
• Welcome to the Planets
• Explore Mars Now
• Windows to the Universe
• Galaxy Zoo.org
• Current Night Sky
• Sky & Telescope's Interactive Sky Chart
• Spot the Station.gov
• Spacelog (transcriptions from NASA missions)
• Superstring Theory
• HyperPhysics
• Quantum Reality
• Comparisons of Major Quantum Interpretations
• Nova's Time Travel
• John Gribbin's Time Travel
• Steve Preston's Time Travel
• The 11 Greatest Unanswered Questions of Physics
• Chemical Elements
• Interactive Periodic Table of Elements
• Constancy of The Speed of Light
• João Magueijo's Varying Speed of Light Theory
• The Laws List
• Multiwavelength Astronomy
• Cool Cosmos
• Chromoscope.net (see the sky in different wavelengths)
• Asteroid and Comet Impact Hazards
• Impact Calculator (calculates impacts of asteroids)
• Impact Earth (calculates effects of meteor impacts)
• Celestia space exploration pgm
• Stellarium (A free open source planetarium for your computer.)
• Math & Physics Java simulatons