Eridani. The recently discovered exoplanet is … Planets above 10 Earth masses are termed massive solid planets,[12] mega-Earths,[13][14] or gas giant planets,[15] depending on whether they are mostly rock and ice or mostly gas. Scientists discovered a new ‘super-Earth,’ and want to know if it could sustain life. In addition, this type of observation does not repeat, and the probabilities of catching a planet at the same time are extremely low, Martin said. Why is the Earth called a unique planet in our solar system ? The planet's year lasts about 617 Earth days, even though its orbit falls somewhere between those of Earth and Venus around our sun. According to one hypothesis,[93] super-Earths of about two Earth masses may be conducive to life. Further theoretical work by Valencia and others suggests that super-Earths would be more geologically active than Earth, with more vigorous plate tectonics due to thinner plates under more stress. Magnesium oxide, which is rocky on Earth, can be a liquid metal at the pressures and temperatures found in super-Earths and could generate a magnetic field in the mantles of super-Earths. In September 2012, the discovery of two planets orbiting Gliese 163[49] was announced. [75] In particular, the complete removal of the primordial H/He envelope by energetic stellar photons appears almost inevitable in the case of Kepler-11b, regardless of its formation hypothesis. In June 2008, European researchers announced the discovery of three super-Earths around the star HD 40307, a star that is only slightly less massive than our Sun. The first super-Earths were discovered by Aleksander Wolszczan and Dale Frail around the pulsar PSR B1257+12 in 1992. [55] At 17 Earth masses it is well above the 10 Earth mass upper limit that is commonly used for the term 'super-Earth' so the term mega-Earth has been proposed. 'Super Earth' planet could have right conditions for life, Jupiter glows like a jack-o'-lantern in new images that reveal secrets about the Great Red Spot, Your California Privacy Rights/Privacy Policy. (2013), list of 1235 extrasolar planet candidates, List of nearest terrestrial exoplanet candidates, "Newly Discovered Exoplanet May be Best Candidate in Search for Signs of Life - Transiting rocky super-Earth found in habitable zone of quiet red dwarf star", "Canada's orbiting telescope tracks mystery 'super Earth, "Life could survive longer on a super-Earth", "A team of ICE/IEEC astronomers announces the discovery of a possible terrestrial-type exoplanet orbiting a star in the constellation of Leo", Astronomers find a new type of planet: The 'mega-Earth', "Exoplanets: From Exhilarating to Exasperating, 22:59, Kepler-10c: The 'Mega-Earth, Bulletin of the American Astronomical Society, "AFP: Astronomers discover clutch of 'super-Earths, "The CoRoT-7 planetary system: two orbiting Super-Earths", "32 planets discovered outside solar system", "Second Smallest Exoplanet Found To Date At Keck", "The HARPS search for southern extra-solar planets XXVII. [11] This is compensated for however, as the star, with a spectral type G5V is slightly dimmer than the Sun (G2V), and thus the surface temperatures would still allow liquid water on its surface. Within this range of radii the super-Earth Gliese 876 d would have a surface gravity between 1.9g and 3.3g (19 and 32 m/s2). © 2020 USA TODAY, a division of Gannett Satellite Information Network, LLC. The first super-Earth around a main-sequence star was discovered by a team under Eugenio Rivera in 2005. Instead of a primarily rocky composition, the more accurately determined mass of Kepler-10c suggests a world made almost entirely of volatiles, mainly water. [32], The National Science Foundation announced on 29 September the discovery of a fourth super-Earth (Gliese 581g) orbiting within the Gliese 581 planetary system. This star also has a Jupiter-like planet that orbits every three years. [91] Though the atmosphere of Venus traps more heat than Earth's, NASA lists the black-body temperature of Venus based on the fact that Venus has an extremely high albedo (Bond albedo 0.90, Visual geometric albedo 0.67),[91] giving it a lower black body temperature than the more absorbent (lower albedo) Earth. In April 2007, a team headed by Stéphane Udry based in Switzerland announced the discovery of two new super-Earths within the Gliese 581 planetary system,[18] both on the edge of the habitable zone around the star where liquid water may be possible on the surface. [62], In February 2018, K2-141b, a rocky ultra-short period planet (USP) Super-Earth, with a period of 0.28 days orbiting the host star K2-141 (EPIC 246393474) was reported. Subsequent research suggested Gliese 581c had likely suffered a runaway greenhouse effect like Venus.

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