Kepler-186f, the first Earth-size Planet discovered in the Habitable Zone

Astronomers had discovered an Earth-sized planet in habitable zone, named Kepler-186f orbiting Kepler-186 system in the constellation Cygnus.

Created On: Apr 19, 2014 11:11 ISTModified On: Apr 19, 2014 12:41 IST

Kepler-186fAstronomers on 17 April 2014 announced that they have discovered an Earth-size planet, named Kepler-186f. The planet is located in the habitable zone—a range of distance from a star where liquid water might pool on the planet's surface. It is a part of the Kepler-186 system, which is located about 500 light-years from Earth in the constellation Cygnus.

This Kepler-186f also called as the Earth cousin, orbits around a red dwarf (M dwarf), which is a type of star much smaller and dimmer than Earth’s sun. Our galaxy has about 100 billion stars of which seven out of every ten of them are M dwarfs.

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The astronomers have claimed that discovery of Kepler-186f has confirmed that Earth-size planets actually exist in the habitable zones of other stars. This also signals a significant step closer to find a world similar to earth.

Size and the period of orbiting the star by Kepler-186f
• The astronomers claimed that the exoplanet is known to be less than 10% larger than Earth but they doesn’t know about its mass, composition and density. The previous study suggests that a planet size of discovered Kepler-186f is rocky.
• It orbits its star in 130 days and it receives one-third energy from its star as Earth receives from our sun.
• The Kepler-186 system’s star is half in size and mass of the sun and is a home of four inner planets

Prior to the discovery of Kepler-186f, a similar Earth-like planet was Kepler-62f that was 40% larger than the size of Earth and it also orbited its star in habitable zone. Kepler-186f is a tip-of-the-iceberg discovery.

Elisa Quintana is the Study leader and is a planetary scientist at NASA Ames Research Center at Moffett Field

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