美国spaceX的做法，让第二级在太空无控飞几年，就算砸到人也是以后的事
https://www.theverge.com/2021/4/2/22364582/spacex-rocket-debris-falls-farm-washington

While most second stage parts either hang out in orbit for years or reenter Earth over the ocean, last week’s stage put on a spectacular nighttime show over populated areas in the northwestern US. And somehow from that show, a COPV ended up embedded roughly 4 inches into the property owner’s farmland, some 100 miles inward from the Pacific coast.
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