太空里全是“垃圾”。
Space is full of junk like used rocket parts and dead satellites. These objects continue to orbit Earth at about 17,500 mph — 10 times as fast as a speeding bullet.
太空里全是垃圾,如报废的火箭部件和卫星,它们继续以约17500英里的时速绕行地球——时子弹飞行速度的10倍。
The Space Surveillance Network (SSN) keeps track of how much debris is out there. The SSN is currently tracking 23,000 objects larger than a softball.
美国空间监视网一直在追踪太空中的垃圾数量,目前共有2.3万件体积大于垒球的太空垃圾。
Space junk is dangerous because one collision could trigger a chain reaction of objects hitting each other, resulting in a thick cloud of debris that would make space travel extremely dangerous.
太空垃圾非常危险,因为一旦发生碰撞,可能会造成连锁反应,由此产生的厚厚的“垃圾云”会让太空旅行变得极为危险。
The Apollo astronauts' footprints on the moon could last up to 100 million years.
“阿波罗”宇航员在月球表面留下的脚印最多可存在1亿年。
Moon rocks erode at a rate of 0.04 inches every 1 million years. This means that the astronauts' footprints on the moon from the Apollo mission in 1969 could be there for 10 to 100 million years.
月球岩石的侵蚀速率为0.04英寸(0.1厘米)/100万年。也就是说,1969年,美国宇航员执行阿波罗任务时在月球表面留下的脚印能够存在1千万到1亿年。
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