Gravitational Microlensing

Gravitational microlensing

The University of Auckland’s technique, called gravitational microlensing, instead measures the number of Earth-size planets that orbit at twice the Sun-Earth distance. This results in a list of planets that are generally cooler than Earth — but by interpolating between this new list, and Kepler’s list, the Kiwi astronomers hope to generate a more accurate list of habitable, Earth-like planets. “We anticipate a number in the order of 100 billion,” says Yock.

http://www.extremetech.com/extreme/152573-astronomers-estimate-100-billion-habitable-earth-like-planets-in-the-milky-way-50-sextillion-in-the-universe

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