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Ariane 504 launch
Ariane 504 launch
10 December
 
1999: On 10 December 1999, ESA's XMM-Newton mission was launched.

XMM-Newton can detect more X-ray sources than any previous satellite and is helping to solve many cosmic mysteries of the violent Universe, from black holes to the formation of galaxies.

XMM-Newton’s high-tech design uses over 170 wafer-thin cylindrical mirrors spread over three telescopes.  
 

 
 
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Related links
A history of European space scienceXMM-Newton overview
 
 
 
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