http://www.aerospacee.com/templates/Default/img/logo.gifhttp://www.aerospacee.com/http://www.aerospacee.com/astronomy/astrophysics/http://www.aerospacee.com/astronomy/astrophysics/Geometrical-Physics-l506.htmlastrophysicist Jean-Pierre Petit presents his research in physics, cosmology, astronomy and mathematics. In French and English. http://www.aerospacee.com/astronomy/astrophysics/Johns-Hopkins-University-Sloan-Digital-Sky-Survey-Group-l3950.html http://www.aerospacee.com/astronomy/astrophysics/Sloan-Digital-Sky-Survey-SDSS-l3951.htmlthis survey's goal is to probe the large-scale structure of the universe by systematically mapping one fourth of the sky. http://www.aerospacee.com/astronomy/astrophysics/Space-Time-Mass-l508.htmlthe 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.aerospacee.com/astronomy/astrophysics/Spectrashift-com-l509.htmldedicated to amateur redshift measurements. This site gives information on spectroscope construction, software processing, data examples, and more.