Mission Archive

2 missions found

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XMM-Newton

Active

ESA · 1999

High Earth orbit

ESA's X-ray observatory, whose three telescopes give it an unusually large collecting area for studying faint sources, from comets to distant galaxy clusters.

ROSAT

Completed

NASA/DLR/SERC · 1990

Low Earth orbit

A German-led X-ray observatory, built with the United States and the United Kingdom, that made the first imaging X-ray survey of the whole sky and catalogued more than 150,000 sources.