now available free online, courtesy of The Richard Dawkins Foundation for Reason and Science. The en...
Ταξίδι στο Σύμπαν, από το Αμερικανικό Μουσείο Φυσικής ...
In this University of Southern California program, Robert Kuhn hosts a group of distinguished paneli...
Professor Russell Stannard investigates what is beyond the observable universe and explores claims t...
Frontiers/Controversies in Astrophysics (ASTR 160) Class begins with a review of the issues previous...
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Abstract: theconclusionthatthe remustbeasubstantial dierentialbetweenthe mass-to-lightratioso fmostgalaxiesandthos einasmallnumberofspe cialplaces. Specically,M=L=1000M =Lisindicatedforthef ullVirgoClusterwhile M=L=150M=Lisappropri ateformostenvironmen ts.Itisarguedthat ahigherM=Lvalueischa racteristicofE/S0kno ts,regionswherethega laxy densityishighandcoll apsetimescalesaresho rt.Regionslargerthan galaxies wherecollapseisocurr ingonlyontheorderoft heageoftheuniverse,t he environmentwherespir alsandirregularspred ominate,arecharacter izedby alowM=L.Overall,them eandensityoftheunive rseiswellbelowclosur e.