宇宙年(cosmic year) 定义:整个太阳系绕银河系中心运动,速度约为250千米/秒,转一周经历2.25~2.5亿年,称之为1个宇宙年。
纵观我们物种在宇宙中的位置,我们可以清楚地看到,就算我们活不上几百年或几千年,也极有可能活上几十年。
Take a broader look at our species' place in the universe, and it becomes clear that we have an excellent chance of surviving for tens, if not hundreds, of thousands of years.
这张图拍摄于九十年代中期,来自名为克莱门汀的美国宇宙飞船。
This image is from the mid-90s, from the American spacecraft called Clementine.
1995年,伽利略号宇宙飞船捕获了关于木星大气的数据——也就是说,大部分预测的大气中没有水——这挑战了关于木星结构的主流理论。
In 1995 the Galileo spacecraft captured data about Jupiter's atmosphere—namely, the absence of most of the predicted atmospheric water—that challenged prevailing theories about Jupiter's structure.
It takes so long that by the time the spaceship comes back, 100 years will have gone by.
去了很久,以至于宇宙飞船回来的时候,100年都已经过去了。
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