'A promising but labour-intensive technique to find alien worlds has netted its first multiple-planet system, a new study reveals. The technique, called microlensing, can find smaller planets than rival methods, and one day might be able to find distant counterparts to Earth.
'More than 250 planets have been discovered orbiting other stars. Most were found using the so-called radial velocity technique, which searches for telltale wobbles in a star caused by the gravitational tugs of an orbiting planet.' (News Scientist Space article).
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