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Astronomers Home : Space : Astronomy : Astronomers Directory Listing(s) • CarlSagan.com home of Carl Sagan Productions. • Edwin Hubble .com offers biographical information for, and quotes from, the man who was first able to show that the universe is expanding, and is considered to be the father of observational cosmology. • Galileo-Galilei.org pictures and quizzes dedicated to Galileo Galilei, his inventions, and discoveries. • House of Ptolemy concentrates on the Ptolemies and their world, from 331 - 30 BCE. • Johannes Kepler (1571 - 1630) covering the life and work of the 16th century astronomer. • Nantucket Maria Mitchell Association dedicated to increasing knowledge and public awareness of the universe and the natural world through programs of scientific research and education.

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