Artist's impression of an emission of a gamma ray (γ) from an atomic nucleus
Artist's representation of M33 X-7: a binary system in the nearby galaxy M33, containing a massive blue star feeding material to a black hole surrounded by a small accretion disk.
An artist's concept of a close Algol-type binary. The relative size of the Sun is illustrated by the small circle to the upper right of the figure. Illustration courtesy of M. Richards.
BIG "error circle" - Gamma Ray Bursts: Some History