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放心，这不是 UFO，只是 Falcon 9 升空的尾流
source link: https://cn.engadget.com/2017/12/24/spacex-falcon-9-LA-cloud-ufo/
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早前 SpaceX 在加州圣巴巴拉的 Vandenberg 空军基地发射的一枚 Falcon 9 火箭，没想到要惹起南卡州市民的一片哗然。因为在火箭发射后残留的尾流，就在当地傍晚的空中形成奇怪的形状，不少民众都以为是 UFO 而热烈议论，最后就连 Elon Musk 都来凑热闹呢！
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