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Fraser
2006-Sep-08, 09:14 PM
Black holes might be invisible, but the superheated matter piling up around them shines brightly in the gamma ray spectrum. Most of these black holes are so far away, their gamma rays look like a diffuse background radiation that covers the sky. ESA's Integral spacecraft recently calibrated the level of this background radiation by watching a point of sky, and let the Earth pass in front of it, to slowly block it out. Using these calculations, astronomers will be better able to distinguish point sources of gamma rays from the wash of background radiation.

Read the full blog entry (http://www.universetoday.com/2006/09/08/finding-all-the-black-holes/)

mahesh
2008-Apr-16, 11:55 AM
Rest In Peace

John Archibald Wheeler Esq.