I have this theory that, to us the world is a flat thing we stand on, but to birds it is a cliff they cling to, a huge ball and they cling to the side and then fall off and fly and glide.
That's according to a new theory that says this smaller moon eventually went careening into our moon and is still there, in the form of mountains on its far side.
根据新理论学说，这个较小的伴月最终倾斜进入我们熟悉的月球，并且以山脉的形式一直处在月球的远端。
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In theory this should spur cooperation between the approximately 1.3 billion people who live in the river basins on either side of the Himalayas.