ESA's XMM-Newton is the most sensitive X-ray telescope ever built. Its high-technology design uses over 170 wafer-thin cylindrical mirrors spread over three telescopes.
Its orbit takes it almost a third of the way to the Moon, so that astronomers can enjoy long, uninterrupted views of celestial objects.
This unique X-ray observatory was launched by Ariane 5 from the European spaceport at Kourou in French Guiana on 10 December 1999. It derives its name from its X-ray multi-mirror design and honours Sir Isaac Newton.