Gliese 581g是环绕红矮星Gliese 581两颗行星中的其中一颗,它的发现使该行星系内行星数量增加至6颗。研究人员称,另一颗新发现的行星是Gliese 581f,位于适宜居住区域之外。
The star is located 20 light-years from Earth in the constellation Libra. Red dwarf stars are about 50 times dimmer than our sun. Since these stars are so much cooler, their planets can orbit much closer to them and still remain in the habitable zone. Estimates suggest Gliese 581g is 0.15 astronomical units (One astronomical unit is the average distance between the Earth and sun) from its star, close enough to its star to be able to complete an orbit in just less than 37 days.
而红矮星Gliese 581位于天秤星座,距离地球20光年,大约比太阳昏暗50倍。由于这样的恒星温度相对较低,它的行星在近距离环绕其运行的同时还能保持着适宜的气候和温度。初步分析认为Gliese 581g与恒星的距离为0.15个天文单位(一个天文单位约等于地球至太阳的平均距离),较近的轨道距离使得该行星公转一周只需37天。
Gliese 581g has a mass three to four times Earth's, the researchers stimated. From the mass and estimated size, they said the world is probably a rocky planet with enough gravity to hold onto an atmosphere. Just as Mercury is locked facing the sun, the planet is tidally locked to its star, so that one side basks in perpetual daylight, while the other side remains in darkness. This locked configuration helps to stabilize the planet's surface climate, Vogt said. Between blazing heat on the star-facing side and freezing cold on the dark side, the average surface temperature may range from minus 31 to minus 12 degrees Celsius, the researchers said.
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