Milky Way Galaxy Map Planets


Wiki source

Both gravitational microlensing and planetary transit observations indicate that there may be at least as many planets bound to stars as there are stars in the Milky Way, [71] and microlensing measurements indicate that there are more rogue planets not bound to host stars than there are stars. [72][73] The Milky Way contains at least one planet per star, resulting in 100–400 billion planets, according to a January 2013 study of the five-planet star system Kepler-32 with the Kepler space observatory. A different January 2013 analysis of Kepler data estimated that at least 17 billion Earth-sized exoplanets reside in the Milky Way. [74] On November 4, 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs within the Milky Way. [75][76][77] 11 billion of these estimated planets may be orbiting Sun-like stars. [78] The nearest such planet may be 4. 2 light-years away, according to a 2016 study. [79] Such Earth-sized planets may be more numerous than gas giants. Besides exoplanets, "exocomets", comets beyond the Solar System, have also been detected and may be common in the Milky Way. [80]