AbsoluteAstronomy.com
General facts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects.
http://www.absoluteastronomy.com/
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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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Astronomy Picture of the Day Archive
Daily updates, archives since June 1995. Descriptions and bookmarks by an astronomer.
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The Why Files | The Science Behind the News
Illuminates the science, math, and technology lurking behind the headline news.
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Fact Monster: Online Almanac, Dictionary, Encyclopedia, and Homework Help — FactMonster.com
Fact Monster is a free reference site for students, teachers, and parents. Get homework help and find facts on thousands of subjects, including sports, ...
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NASA Science - Science Mission Directorate
Research news from NASA.
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Skymaps.com - Publication Quality Sky Maps & Star Charts
Offers free sky maps of the northern and southern hemispheres for stargazing purposes.
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SAO/NASA ADS: ADS Home Page
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Archaeoastronomy pinpoints equinox, solstice and cross quarter moments throughout the year
Track seasonal cusp moments in universal time, according to the Earth's orbit. Includes lessons on the astronomical mechanics of equinoxes, soltices, and cross quarters.
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Astronomy Picture of the Day
A different astronomy and space science related image is featured each day, along with a brief explanation.
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http://www.calsky.com/
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