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  3. A New Need for Traffic Lights Space is getting crowded. That’s the latest worry for many scientists. About ten thousand obje

A New Need for Traffic Lights Space is getting crowded. That’s the latest worry for many scientists. About ten thousand obje

admin2010-02-17  69
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答案 A New Need for Traffic Lights Space is getting crowded. That’s the latest worry for many scientists. About ten thousand objects are orbiting our planet now. Some are satellites that have a job to do. Other items have finished their work. Parts of rockets may have been discarded during a flight and left behind in space. This is becoming a real problem. More items in space lead to more danger. Some of the objects now floating through space are just a few inches in size. But they can still do harm. If they hit a spacecraft or spacelab, they might destroy it. Space agencies can now locate objects in space with a computer. Yet, accidents still happen. Someone may see that two objects seem to be very close. But they have no power to prevent the crash.Experts can only plot courses to help future rockets avoid some of the objects.
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