Three unusually long-lasting stellar explosions discovered by NASA's Swift satellite represent a previously unrecognized class of gamma-ray bursts. Two international teams of astronomers studying these events conclude that they likely arose from the catastrophic death of supergiant stars hundreds of times larger than the sun.
Fuente : http://www.eurekalert.org/pub_releases/2013-04/nsf...
Fuente : http://www.eurekalert.org/pub_releases/2013-04/nsf...