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astrophysicist Jean-Pierre Petit presents his research in physics, cosmology, astronomy and mathematics. In French and English.
http://www.jp-petit.com/
dedicated to discussion about the universe, how it is evolving, and the kinds of objects and phenomena it contains. A service of NASA's High-Energy Astrophysics Learning Center.
http://imagine.gsfc.nasa.gov/
http://www.sdss.jhu.edu/
this survey's goal is to probe the large-scale structure of the universe by systematically mapping one fourth of the sky.
http://www.sdss.org/
the fabric of space-time is another state of matter and hence it has equivalent mass. The missing mass of the Universe is in the space-time itself that fills the cosmos.
http://www.space-time-mass.com/
dedicated to amateur redshift measurements. This site gives information on spectroscope construction, software processing, data examples, and more.
http://www.spectrashift.com/