Radio astronomers have created a 'virtual' radio telescope with a dish size greater than the diameter of the Earth. The technique of very long baseline interferometry (VLBI) has been used to combine signals from 40 ground-based radio telescopes and the 8-metre HALCA telescope in space. The VLBI space observatory project (VSOP) has now released some of the best images of quasars ever seen (Science 281 1825).
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