Kepler-20f

Kepler-20f is an extrasolar planet orbiting the star Kepler-20 in the constellation of Lyra. It is the first confirmed Earth-sized planet orbiting a Sun-like star found by the Kepler Space Telescope.[1][2][3][4] The planet has a radius 1.03 times Earth's (1.03 terrestrial radii) and has a predicted equilibrium temperature of 800 °F (427 °C) based on an assumed albedo of 0.3.[5] It orbits its star at 10 million mi (16.1 million km), or nearer than Mercury orbits Sol.[5] The discovery of the planet demonstrated for the first time the ability of Kepler to observe Earth sized exoplanets.[1][2][3][4] The discovery of Kepler-20f[5] was announced with the discovery of another terrestrial-mass planet in the same system, Kepler-20e.[6]

References

  1. ^ a b Johnson, Michele (20 December 2011). "NASA Discovers First Earth-size Planets Beyond Our Solar System". NASA. http://www.nasa.gov/mission_pages/kepler/news/kepler-20-system.html. Retrieved 2011-12-20. 
  2. ^ a b Hand, Eric (20 December 2011). "Kepler discovers first Earth-sized exoplanets". Nature. doi:10.1038/nature.2011.9688. 
  3. ^ a b Overbye, Dennis (20 December 2011). "Two Earth-Size Planets Are Discovered". New York Times. http://www.nytimes.com/2011/12/21/science/space/nasas-kepler-spacecraft-discovers-2-earth-size-planets.html. Retrieved 2011-12-21. 
  4. ^ a b Moskowitz, Clara (20 December 2011). "First Ever 'Earth-Sized' Alien Planets Discovered". Fox News Channel. http://www.foxnews.com/scitech/2011/12/20/first-ever-earth-sized-alien-planets-discovered/. Retrieved 2011-12-20. 
  5. ^ a b c d NASA Staff (20 December 2011). "Kepler: A Search For Habitable Planets -Kepler-20f". NASA. http://kepler.nasa.gov/Mission/discoveries/kepler20f/. Retrieved 2011-12-23. 
  6. ^ a b NASA Staff (20 December 2011). "Kepler: A Search For Habitable Planets - Kepler-20e". NASA. http://kepler.nasa.gov/Mission/discoveries/kepler20e/. Retrieved 2011-12-23. 

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