A Blue Supergiant Star (IMAGE)

NASA/Goddard Space Flight Center

A Blue Supergiant Star

Caption

A blue supergiant star, illustrated here, may be the most likely source of ultra-long gamma-ray bursts like GRB 130925A, which last hours rather than seconds. These stars contain about 20 times the sun's mass and may reach sizes large enough to span Jupiter's orbit.

Credit

NASA's Goddard Space Flight Center/S. Wiessinger

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