After analyzing the known exoplanets and comparing that data with what they know about the Milky Way, astronomers at Cornell University predict that as many as 100 million worlds in our galaxy could support complex life.
There are many methods of detecting exoplanets. Transit photometry and Doppler spectroscopy have found the most, but these methods suffer from a clear observational bias favoring the detection of planets near the star; thus, 85% of the exoplanets detected are inside the tidal locking zone. In several cases, multiple planets have been observed around a star. About 1 in 5 Sun-like stars have an “Earth-sized” planet in the habitable zone.
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