Gliese 581g: the planet on which life may be over our




Gliese 581g: the planet on which life may be over our

Gliese 581g

In 2010, a team of hunters planets from the University of California Santa Cruz and the Carnegie Institution of Washington has announced the discovery of the planet, which weighs three times the size of Earth and orbits a star right in the center of a “potentially habitable zone.” Planet Gliese 581g orbits the red dwarf star with a turnover of 37 days. Mass ekzoplanety indicates that it is composed primarily of rock and has sufficient gravity to keep the atmosphere.

Planet Gliese 581g is in first place in the list of potentially habitable planets .

Red dwarf sun Gliese 581 is 20 light-years from Earth in the constellation Libra. At its orbit rotates two planet potentially habitable zone, one on the hot side (c), the other (d) – in the cold. Some astronomers believe that the planet d may be habitable, too, if she has a dense atmosphere with greenhouse effect. The newly discovered planet g, however, lies right in the center of potentially habitable zone.

This discovery was the result of observations for more than ten years with the observatory named after VM Keck, where one of the largest telescopes in the world. Research sponsored by NASA and the National Science Foundation, showed that the planets are in the zone in which water can exist in liquid form. If this is confirmed, the above exoplanet is the most Earth-like of all, in addition – a potentially habitable.

For astronomers, a “potentially habitable” planet is one that could sustain life. It is not necessarily the one in which people can flourish. Habitability is based on various factors, but liquid water and atmosphere – the most important ones.

“We thought we would have to see the huge distances to find Earth-like planets. Now we understand that the ” second Earth “can be in our back yard, waiting to find her,” – says Courtney Dressing of the Harvard-Smithsonian Center for Astrophysics (CFA).

6% of red dwarf stars have potentially habitable planets the size of Earth. Red dwarfs – the most common stars in our galaxy. 75% of the nearest stars belong to this class. The nearest Earth-like extrasolar planet is only 13 light years from us. Because red dwarfs are living much longer than stars like the Sun, born logical conclusion that the planets could be much older and more advanced than Earth.

Red dwarfs are smaller, cooler and less sun. Weight normal red dwarf is a third of the sun and its brightness – one-thousandth. CFA team took a sample of 158,000 red dwarf stars from the catalog “Kepler”, and after recalculation made, based on thermal and dimensional figures. It turned out that these stars are much smaller and colder than previously thought.

To further explore the nearby Earthlike worlds will require a separate small telescopes in space or a large network of ground-based telescopes. Thanks to them, we will know if they have chosen the planets atmosphere, warm it or not, as well as chemical composition.

In 2013, Raymond Perhambert the University of Chicago studied a range of climatic conditions, Gliese 581g, and found that “one of the options will have a swimming pool on one side, thereby making the planet look like an eyeball.” Perhambert hopes his efforts will help to identify habitable conditions on other planets, if future observations refute the existence of add on Gliese 581g.

Because Gliese 581g is tied to its star tidal power, one side of it is always bathed in natural light, while the other is in a state of eternal darkness. It is noteworthy that the best conditions for the existence of life will be located on the border of these two extremes, better known as the “terminator”.
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Tags: Gliese 581g , Planets , Exoplanets .

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