How it could happen: Objects from space impact Earth all the time, generally burning up in the atmosphere.

它是怎样产生的：空间物体随时都在影响着地球，一般都在大气层中烧毁。

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The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.

水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。

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However, each partition has its own memory space, and there is no performance impact.

然而，每个分区都有它自己的内存空间，这对性能不会有任何影响。

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Compared to the cost of losing a satellite or a shuttle to space debris impact, "this looks like a bargain, " says Dr. Campbell, who works at NASA's Marshall Space Flight Center in Huntsville, Ala.

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From smoke detectors to cancer treatments, the impact of space exploration affects our everyday lives.

FORBES: NASA Shuttle Exclusive