Harvard scientists have unveiled a new laser-measuring device  making the discovery of Earth-sized planets possible. 
| How to Find Other "Earths"
 A new laser technique could locate planets much like our own.
 | Spotlight on E.T.: Harvard postdoc Chih-Hao Li operates a new laser system for precisely calibrating astronomical spectrographs. The new system should make it possible to detect Earth-like planets for the first time by watching for their effects on the light produced by the stars they orbit. Credit: Chih-Hao Li, Center for Astrophysics
 
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 | Exoplanet: n. a planet that orbits a star outside the solar system. | 
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