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US scientists find potentially habitable planet near Earth
U.S. astronomers said Wednesday they have discovered an Earth-sized planet that they think might be habitable, orbiting a nearby star, and believe there could be many more planets like it in space, the AFP reported.
The planet, found by astronomers at the University of California, Santa Cruz, and the Carnegie Institution of Washington, is orbiting in the middle of the "habitable zone" of the red dwarf star Gliese 581, which means it could have water on its surface, the report said.
According to the scientists, liquid water and an atmosphere are necessary for a planet to possibly sustain life, even if it might not be a great place to live.
The scientists determined that the planet, which they have called Gliese 581g, has a mass three to four times that of Earth and an orbital period of just under 37 days, the report said.
According to Steven Vogt, professor of astronomy and astrophysics at the University of California, Santa Cruz, and one of the leaders of the team that discovered the planet, its mass indicates that it is probably a rocky planet and has enough gravity to hold on to an atmosphere, the AFP said.
The researchers said if Gliese 581g has a rocky composition similar to Earth's, its diameter would be about 1.2 to 1.4 times that of Earth, it said.
The surface gravity would be about the same or slightly higher than Earth's, so that a person could easily walk upright on the planet, Vogt was quoted as saying.
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ȯ ༺ ʷ ߰ߵƴٰ AFP, մ ߴ.
̱ ĶϾƴ Ÿũ罺 б īױ 29 ̱ Ͽ ִ ̱ܿ ȸ κ 20 ó ü ϱ ſ ༺ ۸ (Gliese) 581g ߰ߴ١ ߴٰ ߴ.