NASA’s Kepler planet-finder has started an extended mission that could last as long as four more years, after finding more than 2,300 candidate extra-solar planets in its 3.5-year primary mission by measuring the faint flickers of distant stars.
The candidate list, which must be confirmed by Earth-based observations, includes “hundreds” of planets that are roughly the same size as Earth. A prime objective of the extended mission will be to find a true Earth analog in terms of size, star type and orbit.
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