为确保地面上人的安全，最好的方法是以一个强大的推进器燃烧来使宇宙飞船脱轨，在正确的时间使其慢下来。
To keep people on the ground safe, it's best to deorbit a spacecraft with a strong burn of propellant, to slow it down at the right time.
例如，英国金融服务管理局已经提出了方法来推进对在英国运作的大型银行的补助，以使其持有更多的资本金。
Britain's Financial Services Authority, for instance, has already proposed measures to force subsidiaries of big Banks operating in Britain to hold more capital.
资深科学家詹姆斯·威廉姆斯说：“这样的情况就相当于在月球沿着其轨道运行的时候对它施加能量，使其摆脱对地球的公转。”他就职于加利福尼亚州帕萨迪纳市的美国国家航空航天局喷气推进实验室。
"You're putting energy into the moon's orbit and taking it out of the Earth's spin," says James Williams, a senior research scientist at NASA's Jet Propulsion Laboratory in Pasadena, Calif.
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