9 December
1978: On 9 December 1978, NASA's Pioneer Venus Multiprobe (PVM) entered the atmosphere of Venus.PVM consisted of a 'bus', a vehicle which carried one large and three small atmospheric probes. ...
31 DEC. 2003
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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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7 December
1905: On 7 December 1905, Dutch-American astronomer Gerard P. Kuiper was born in Harenscarpel, the Netherlands.
6 December
1631: On 6 December 1631, the transit of Venus occurred as first predicted by Kepler.
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