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Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is the prototype nearby starburst galaxy about 12 million light-years away in the constellation Ursa Major. The starburst galaxy is five times as bright as the whole Milky Way and one hundred times as bright as our galaxy's center. NASA/courtesy of The center of the Milky Way as seen by EGRET in gamma-rays. NASA/courtesy of Messier 87 galaxy is shooting an emission jet from its core spread out over some 5000 light years. It is strongly suggested that the jet is powered by an accretion disk around a supermassive black hole in the galaxy's center. NASA/courtesy of Remnant of the Crab Supernova that exploded in 1054 and is to this day the brightest persistent source of gamma and x-rays in the sky. At the center of the nebula is the Crab pulsar formed during the explosion. NASA/courtesy of Artist's represenation of a double system containing a compact object (black hole) and a massive dying star. The black hole is "stealing" the giant's material onto its accretion disk and radiating it perpendicularly in the form of jets. NASA/courtesy of Hubble's images of the galaxies hosting the given GRBs. NASA/courtesy of V838 Monocerotis is a variable star affected by the phenomenon of light echoes - light reflecting off interstellar matter and producing an illusion of rings around it. NASA/courtesy of