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XMM-Newton 'spare-time' provides impressive sky survey For the past four years, while ESA`s XMM-Newton X-ray observatory has been slewing between different targets ready for the next observation, it has kept its cameras open and used this spare time to quietly look at the heavens. The result is a 'free-of-charge' mission spin-off - a survey that has now covered an impressive 25 percent of the sky.
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