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XMM-Newton gives new insight into neutron stars

8 January 2008

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In a neutron star (left), the quarks that comprise the neutrons are confined inside the neutrons. In a quark star (right), the quarks are free, so they take up less space and the diameter of the star is smaller.

Credits: NASA/CXC/M.Weiss

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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.

Credits: ESA - D. Ducros

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