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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 dwarf stars within the Milky Way galaxy. [7] [8] Eleven billion of these estimated planets may be orbiting Sun-like stars. [9]
Some exoplanet candidates detected by radial velocity that were originally thought to be potentially habitable were later found to most likely be artifacts of stellar activity. These include Gliese 581 d & g , [ 55 ] [ 56 ] [ 57 ] Gliese 667 Ce & f, [ 15 ] [ 58 ] Gliese 682 b & c, [ 8 ] Kapteyn b , [ 59 ] [ 60 ] and Gliese 832 c .
Candidate 1 (also known as C1 or Alpha Centauri Ab) is an exoplanet candidate directly imaged around Alpha Centauri A in February 2021. If confirmed as an exoplanet, it would orbit at approximately 1.1 AU away from Alpha Centauri A with a period of about a year and would have a mass between that of Neptune and one-half that of Saturn and would therefore likely be a giant planet. [1]
List of nearest exoplanets - Wikipedia
Nearest F-type main sequence star with a multiplanetary system. Second-brightest star in the night sky with a multiplanetary system after 7 Canis Majoris. All exoplanets orbit around star A in the binary system. 47 Ursae Majoris: Ursa Major: 10 h 59 m 27.97 s +40° 25′ 48.9″ 5.10: 46: G0V: 1.029: 5892: 7.434: 3
Candidate isolated black hole detected by microlensing [18] 18 h 05 m 05.28 s: −28° 34′ 41.70″ 2002 BH: 7.5: Very strong candidate 25 600 ± 600: 7.86 ± 0.2: Sagittarius A*: Supermassive black hole 17 h 45 m 40.0409 s: −29° 0′ 28.118″ 1974 BH: 4 154 000 ± 14 000: Center of the Galaxy 29 700 ± 2700: 9.1 ± 0.8: 4U 1543-475 ...
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Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.