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Gliese 832 C
Gliese 832 c (also known as Gl 832 c or GJ 832 c) was a candidate exoplanet located 16.2 light-years (4.97 parsecs) away in the constellation of Grus, orbiting the star Gliese 832, a red dwarf. The existence of the planet was refuted in 2022, when a study found that the radial velocity signal shows characteristics of a signal originating from stellar activity, and not from a planet. It was thought to be in its star's habitable zone and to receive about the same amount of solar flux as Earth. The planet was thought to have a minimum mass of 5.4 Earth masses. Characteristics Mass, radius, and temperature Gliese 832 c was thought to have a minimum mass of approximately 5.4 times that of Earth. If it had the same density as Earth, it would have a radius of around 1.75 . The planet was thought to have a relatively high eccentricity, taking it very near to the predicted inner edge of the habitable zone. The planet's average equilibrium temperature was predicted to be , but was e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomical Unit
The astronomical unit (symbol: au, or or AU) is a unit of length, roughly the distance from Earth to the Sun and approximately equal to or 8.3 light-minutes. The actual distance from Earth to the Sun varies by about 3% as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once each year. The astronomical unit was originally conceived as the average of Earth's aphelion and perihelion; however, since 2012 it has been defined as exactly (see below for several conversions). The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec. History of symbol usage A variety of unit symbols and abbreviations have been in use for the astronomical unit. In a 1976 resolution, the International Astronomical Union (IAU) had used the symbol ''A'' to denote a length equal to the astronomical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
