GX 339-4 (IMAGE)

NASA/Goddard Space Flight Center

GX 339-4

Caption

GX 339-4, illustrated here, is among the most dynamic binaries in the sky, with four major outbursts in the past seven years. In the system, an evolved star no more massive than the sun orbits a black hole estimated at 10 solar masses.

Credit

ESO/L. Calçada

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