theatlantic.com – HD 131399Ab isn’t the first planet found to have three suns. But it is the first such planet to be found in a wide-orbit system—by far the widest known within a multi-star system. This is weird because multi-star systems are usually so unstable that they ejects planets, which are subject to competing gravitation force from all those suns.This particular planet’s unexpected survival is therefore peculiar, and perhaps revealing. It could mean that such systems are more commonly hosts to planets that scientists tend to think, according to a paper published in the journal Science on Thursday.
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