|Russian satellite on mission to peer inside black holes|
19 July 2011
At 10 metres, RadioAstron’s antenna is small compared to Earth’s largest radio telescopes, which span 100 metres or more. But when its signals are combined with those of telescopes on the ground - a technique called interferometry - the resulting observations are as sharp as those produced by a single telescope with a dish as wide as the maximum distance between the component antennas.
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