An earth copy outside the solar system appears

For the first time, scientists discovered planets that exist in liquid form similar in size to the earth.

For decades, scientists have been searching for a planet like the earth outside the solar system. And now, efforts have paid off when such a planet has appeared.

The planet of scientists expected to contain this extraterrestrial life is called Kepler-186f. As described by astronomers in the Science Journal, this is the first planet to have liquid water among the searched planets.

Kepler- 186f is about the size of the earth, especially containing water on the surface.(NASA photo)

The planet is about 1.1 times the size of the Earth, about 490 light years and one year at Kepler-186f, about 130 days. However, the mass and surface composition of Kepler-186f has not been determined.

Kepler-186 is in the same system of four other planets orbiting a M1-type red dwarf that is about half the size and mass of our sun. Therefore, the brightness of this planet received at noon will be equal to the earth 1 hour before sunset.

Kepler-186f planet was discovered by a group of scientists led by Elisa Quintana of the Institute for Extraterrestrial Life Research (SETI) at NASA's Ames Research Center. So far, hundreds of planets have been discovered but most of them are too large or too close to be eligible for life.

NASA photo of the landscape on Kepler-186f

'Size is an extremely important factor. If a planet is about 1.5 times the size of the earth, its mass will be very large. Its gravity will absorb both hydrogen and helium, making the atmosphere covered too thick to be suitable for life development, ' scientists said.

Dr Steve Howel - one of the main authors of this finding, said: 'Taking their planet as an example, water is an extremely important factor for life. Kepler-186f's ability to survive liquid water will provide an opportunity to find a new life beyond the solar system. '

The Kepler Space Telescope is designed to allow simultaneous monitoring of about 150,000 stars every 30 minutes, thereby helping to detect new stars and new planets.