月球的命运：地球的永恒伴侣将何去何从

The moon is Earth’s constant companion. But will that always be the case? BY PHIL PLAIT EVERY TIME I SEE THE MOON in the sky, it makes me happy. Our natural satellite is so familiar it’s easy to take it for granted, but in fact it’s an amazing sight. Much of its history is written on its face, with huge dark spots marking where ancient gigantic impacts scarred its surface, still visible after billions of years. But what of its fate? What will happen to the moon in eons hence? That future is tied up in how it formed, how it’s gravitationally linked to Earth and, in the end, what the sun has to say about all this. …