GMAT
Since the start of the space age, there have been more and more littering of orbits near Earth, often because of the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.
Since the start of the space age, orbits near Earth have become more and more littered, often from the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.
题目基本信息