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Proxima Centauri is a red dwarf star with a mass about 12.5% of the Sun's mass (M ☉), and average density about 33 times that of the Sun. Because of Proxima Centauri's proximity to Earth, its angular diameter can be measured directly. Its actual diameter is about one-seventh (14%) the diameter of the Sun.
Proxima Centauri b is the closest exoplanet to Earth, [19] at a distance of about 4.2 ly (1.3 parsecs). [4] It orbits Proxima Centauri every 11.186 Earth days at a distance of about 0.049 AU, [1] over 20 times closer to Proxima Centauri than Earth is to the Sun. [20] As of 2021, it is unclear whether it has an eccentricity [e] [23] but Proxima Centauri b is unlikely to have any obliquity. [24]
Proxima Centauri (Alpha Centauri C) 107,277 Nearest star and nearest stellar system to the Sun. Has one confirmed potentially habitable exoplanet, one unconfirmed exoplanet and one disputed exoplanet [120] Luyten 726-8 B (UV Ceti) 110,615 The archetypal type of the flare stars, and the eight-nearest star system to the Solar System. [121] GL ...
The closest star to us, Proxima Centauri, is 4.2 light years, 25 trillion miles, distant. Using our current fastest rocket technology, it would take us more than 50,000 years to reach it.
The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets , the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure.
Sun: 1.58 × 10-5 (149,600,000 km) G2V 1 -26.74 [119] 4.83 [119] The star at the centre of the Solar System. Alpha Centauri A (Rigil Kentaurus) 4.344 ± 0.002: G2V [52] 1.2175 ± 0.0055 [53] 1.0788 ± 0.0029 [53] 0.01 [54] 4.38 [55] It is the 2nd/3rd nearest individual star to the Solar System, and the fourth-brightest individual star in the ...
But it’s still about 1600 times closer to us than the closest non-Sun star, Proxima Centauri (PC). It could be that the PC system is humanity’s best candidate for true habitation of a second ...
The planet, dubbed Proxima b because it orbits Proxima Centauri, is thought to be a rocky and slightly more massive than Earth -- but that's not all. Scientists discover Earth-like planet orbiting ...