A planet lighter than a ball of cork is one of the puffiest alien planets known to date.
根据数据已知，比一个软木塞球还轻的行星是最膨胀的外行星之一。
Within seconds, Sack is transported to a combat warship. He is invading alien planets.
没过几秒，萨克就被传送到一艘格斗战舰上，他今天的任务是入侵外星人的行星。
Earth seems to have its first fuzzy photos of alien planets outside our solar system, images captured by two teams of astronomers.
根据两个天文组拍到的照片，地球上的人似乎第一次拍到了太阳系外行星的模糊影像。
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