Astronomical satellite dedicated to the observation of X-rays of cosmic origin.

It was launched in 1970 from the Italian San Marco platform, on the coast of Kenya, and its name derives from a word that in Swahili dialect means freedom.

It was the first satellite used for studies of this type. Its operation, for almost four years, led to the discovery of numerous sources of X-rays, both inside and outside our galaxy, and allowed to draw a map.

Some of these sources are constituted by binary systems: two stars that are in orbit around a common barycenter; in particular some of them could be neutron stars or black holes.

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UFO (UFO)Ultraviolet (astronomy of)