太空人在直徑約三公尺的小行星上修理倒置的火箭引擎，推力垂直朝向岩石，把小行星變成飛船

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A man in a space suit is standing on an asteroid only ten feet in diameter. He is working on a rocket engine that is upside down, with the thrust aimed away from the asteroid, pointing straight down into the asteroid. This turns the asteroid into a s...