Giant leap for planet-spotting technique

PLANETS rarely play peekaboo. But if you are quick, you can spot them before they hide away again. One of the most promising techniques used to detect alien worlds is “microlensing”, which can spot smaller-sized planets than rival techniques. It involves watching how a planet’s gravity bends the light of a distant background star. So far, only four planets have been discovered this way, because such events are temporary, random and do not recur. Last week, however,
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