飞越地球的航天飞机
(原标题: Shuttle Over Earth)
2022-04-17
浏览次数: 25
那是什么？2010年，国际空间站上的宇航员第一次在远处看到了它。不久它就扩大成了一个黑色的剪影。当它更靠近时，它的剪影似乎是一艘宇宙飞船。最后，这个物体显示了自己是奋进号航天飞机，它很快就像预期的那样与地球轨道空间站对接。这张照片是奋进号在接近地球地平线时拍摄的，在那里可以看到地球大气层的几层。在航天飞机的正后方是中间层，呈蓝色。白色的大气层是平流层，而橙色的是地球的对流层。这些薄薄的空气层加在一起——面积不到地球半径的2%——在很多方面维持着我们所有人的生活，包括提供呼吸所需的氧气，以及阻挡来自太空的危险辐射。周五：2022年地球日
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What's that approaching? Astronauts on board the International Space Station in 2010 first saw it far in the distance. Soon it enlarged to become a dark silhouette. As it came even closer, the silhouette appeared to be a spaceship. Finally, the object revealed itself to be the Space Shuttle Endeavour, and it soon docked as expected with the Earth-orbiting space station. Pictured here, Endeavour was imaged near Earth's horizon as it approached, where several layers of the Earth's atmosphere were visible. Directly behind the shuttle is the mesosphere, which appears blue. The atmospheric layer that appears white is the stratosphere, while the orange layer is Earth's Troposphere. Together, these thin layers of air -- collectively spanning less than 2 percent of Earth's radius -- sustain us all in many ways, including providing oxygen to breath and a barrier to dangerous radiations from space. Coming up Friday: Earth Day 2022