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Stories about: optical tracking

ESA Spying on WMAP in Preparation for Gaia How does the ESA prepare for the launch of a new probe? Well, apparently, by taking several pictures of its partner's spacecraft. ESO's La Silla 2.2 meter telescope was recently used by three researchers to photograph NASA's Wilkinson Microwave Anisotropy Probe, orbiting Earth from a distance of 1.5 mi... 9 May 2008 09:15 GMT