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For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 km with a density of 0.5 g/cm 3, its true mass would be only 1.12 × 10 19 kg.
Called Proxima b, the planet is 1.3 times the mass of Earth and has an orbital period of roughly 11.2 Earth days. [10] However, Proxima Centauri's classification as a red dwarf casts doubts on the habitability of any exoplanets in its orbit due to low stellar flux, high probability of tidal locking , small circumstellar habitable zones and high ...
Probably around -20° to 20° N, 60° to 80° E: First impact on the surface of another planet. Contact lost before atmospheric entry. Venera 4: USSR: 23 October 1967: Estimated near 1] Crushed by atmospheric pressure before impact. Venera 5: USSR: 16 May 1969
4.3176782 0.0524 transit 2010 390 1.01 5700 2019 NameExoWorlds Philippines Leklsullun "child/children" in the Pitkern language: HD 102117 (Uklun) 0.172 20.67 0.1532 radial vel. 2004 140 1.03 5672 2019 NameExoWorlds Pitcairn Islands Pirx: Character from the books of Polish author Stanisław Lem: BD+14 4559 (Solaris) 1.47 268.94 0.777 radial vel ...
The official definition of the term planet used by the International Astronomical Union (IAU) only covers the Solar System and thus does not apply to exoplanets. [20] [21] The IAU Working Group on Extrasolar Planets issued a position statement containing a working definition of "planet" in 2001 and which was modified in 2003. [22]
Artist's impression of Kepler, the telescope that detected these exoplanet candidates.. This is a list of unconfirmed exoplanets discovered or detected by the NASA Kepler mission (Kepler Candidates from the NASA Exoplanet Archive) that are potentially habitable.
It is further estimated that 3% to 4.5% of Sun-like stars possess a giant planet with an orbital period of 100 days or less, where "giant planet" means a planet of at least 30 Earth masses. [5] It is known that small planets (of roughly Earth-like mass or slightly larger) are more common than giant planets. [6]
An extragalactic planet, also known as an extragalactic exoplanet or an extroplanet, [1] [2] [3] is a star-bound planet or rogue planet located outside of the Milky Way Galaxy. Due to the immense distances to such worlds, they would be very hard to detect directly. However, indirect evidences suggest that such planets exist.