"Most known extrasolar planets (exoplanets) have been discovered using the radial velocity, or transit methods. Both are biased towards planets that are relatively close to their parent stars, and studies find that around 17–30% of solar-like stars host a planet. Gravitational microlensing, on the other hand, probes planets that are further away from their stars. Recently, a population of planets that are unbound or very far from their stars was discovered by microlensing. These planets are at least as numerous as the stars in the Milky Way."
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Original Language: English
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A. Cassan, et al., in: One or more bound planets per Milky Way star from microlensing observations, Nature, International Journal of Science
https://en.wikiquote.org/wiki/Milky_Way
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Milky Way
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