Although the announcement later proved controversial, astronomers made waves in September when they said they had found a planet outside our solar system with an atmosphere, temperate regions, and—crucially—liquid water, which is considered vital for life as we know it.
Roughly three times more massive than Earth, the planet Gliese 581g is tidally locked to its star, which means that one side is perpetually basked in daylight and the other is in constant darkness.
Astronauts' Fingernails Falling Off
Aliens, if they exist, are most likely to live along the line between shadow and light, a temperate region known as the terminator, the scientists said. Share
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