"There was a big step – jump – that people have questioned," Jackson says. "But now the world is awash with oil and it's not clear that the same calculations still apply."
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The ISS does have its own defenses, of course. Fabric-y buffers envelope some of the systems, and a bumper called the Whipple Shield helps blunt impact. That shield is only built to stop debris up to about 1 cubic centimeter, though, and the debris tracker is only designed to catch pieces 10 cubic centimeters and larger. In other words, there’s a gap in defenses.，推荐阅读爱思助手下载最新版本获取更多信息
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。业内人士推荐heLLoword翻译官方下载作为进阶阅读