Just over 50 years ago, paleontologist Donald Johnson unearthed the remains of "Lucy," an ancient human relative who lived more than 3 million years ago. Now, another group of scientists have found ...

Is it a bird? Is it a plane? No, it's super Neptune! But this Superman-mimicking planet is not blasting through space on its own. It is being dragged along by its parent star.

美国宇航局（NASA）的新研究显示，至少要挖到两米多深才有可能找到火星以前存在生命的证据。对于目前挖掘较浅的任务来说，那么就要调整探索的策略。