http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. (PhysOrg.com) -- While astronomers have studied lightweight and heavyweight black holes for decades, the evidence for black holes with intermediate masses has been much harder to come by. Now, astronomers at NASA's Goddard Space Flight Center in Greenbelt, Md., find that an X-ray source in galaxy NGC 5408 represents one of the best cases for a middleweight black hole to date. http://www.physorg.com/news177073969.html Space & Earth Tue, 10 Nov 2009 11:14:51 EST news177073969 (PhysOrg.com) -- ESA's XMM-Newton orbiting X-ray telescope has uncovered a celestial Rosetta stone: the first close-up of a white dwarf star, circling a companion star, that could explode into a particular kind of supernova in a few million years. These supernovae are used as beacons to measure cosmic distances and ultimately understand the expansion of our Universe. http://www.physorg.com/news171208399.html Space & Earth Thu, 03 Sep 2009 14:54:28 EST news171208399 Since its discovery 45 years ago, Cygnus X-1 has been one of the most intensively studied cosmic X-ray sources. About a decade after its discovery, Cygnus X-1 secured a place in the history of astronomy when a combination of X-ray and optical observations led to the conclusion that it was a black hole, the first such identification. http://www.physorg.com/news170689138.html Space & Earth Fri, 28 Aug 2009 14:39:44 EST news170689138 A new class of black hole, more than 500 times the mass of the Sun, has been discovered by an international team of astronomers. http://www.physorg.com/news165675129.html Space & Earth Wed, 01 Jul 2009 13:52:39 EST news165675129 (PhysOrg.com) -- Using new data from ESA's XMM-Newton spaceborne observatory, astronomers have probed closer than ever to a supermassive black hole lying deep at the core of a distant active galaxy. http://www.physorg.com/news162649947.html Space & Earth Wed, 27 May 2009 13:34:44 EST news162649947 At sunset on Thursday, astronomers around the world will be limbering up for a 100-hour marathon aimed at celebrating the night sky and nurturing the Galileos of tomorrow. http://www.physorg.com/news157871372.html Space & Earth Thu, 02 Apr 2009 06:10:38 EST news157871372 (PhysOrg.com) -- XMM-Newton has caught the fading glow of a tiny celestial object, revealing its rotation rate for the first time. The new information confirms this particular object as one of an extremely rare class of stellar zombie - each one the dead heart of a star that refuses to die. http://www.physorg.com/news151064499.html Space & Earth Tue, 13 Jan 2009 10:21:39 EST news151064499