Tutorial on Earth/Sun Relations and Seasons
To understand why we have seasons, we need to look at the relations ... The sun's rays are pretty close to parallel to each other when they reach the Earth, ...
http://daphne.palomar.edu/jthorngren/tutorial.htm
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My Solar System 2.02
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The Nine Planets Solar System Tour
Multimedia tour of the solar system -- one star, eight planets, and more -- with pictures, text, sound, and references to other resources.
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The Worlds of David Darling
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NASA - Home
Official site for NASA, the United States space agency, providing current information on its robotic and manned space exploration missions.
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EARTH GUIDE
地球ガイド ...
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A Review of the Universe
02. Observable Universe and Beyond. 03. Superclusters. 04. ... 15. Elementary Particles and the World of Planck Scale. 16. Frontier of Science. 17. Appendices ...
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WorldWide Telescope
3D accelerated card with 128 megabytes (MB) RAM; discrete graphics card with ... 1 GB of available hard disk space; 10 GB recommended for off-line features and ...
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Students for the Exploration and Development of Space (SEDS) Home
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Stellarium
Stellarium is planetarium software that shows exactly what ... Sourceforge. Sourceforge is the central website where we collaborate on Stellarium, and where ...
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Centauri Dreams
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