Extrasolar Planets Discovered

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[a] have an “Earth-sized”[b] planet in the habitable zone. [c] Assuming there are 200┬ábillion stars in the Milky Way,[d] it can be hypothesized that there are 11┬ábillion potentially habitable Earth-sized planets in the Milky Way, rising to 40┬ábillion if planets orbiting the numerous red dwarfs are included.

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