从太空拍摄的摩尼瓦根撞击坑
(原标题: Manicouagan Impact Crater from Space)
2024-05-25
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4月11日，在加拿大魁北克上空400公里的轨道上，国际空间站第59远征队的工作人员拍下了这张宽阔的圣劳伦斯河和奇怪的圆形马尼加根湖的快照。中间的右边，环状湖泊是一个现代水库，位于一个直径100公里的古代陨石坑的侵蚀残余物中。从轨道上看，这个古老的陨石坑非常显眼，这是一个明显的提醒，地球很容易受到来自太空岩石的攻击。马尼瓦甘陨石坑有2亿多年的历史，很可能是由直径约5公里的岩石撞击造成的。目前，还没有一颗已知的小行星有很大的可能在下个世纪撞击地球。每个月，美国宇航局的行星防御协调办公室都会发布一份最新的报告，其中包括近地天体接近地球的最新数据，以及可能对地球造成潜在影响的彗星和小行星的其他事实。
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Orbiting 400 kilometers above Quebec, Canada, planet Earth, the International Space Station Expedition 59 crew captured this snapshot of the broad St. Lawrence River and curiously circular Lake Manicouagan on April 11. Right of center, the ring-shaped lake is a modern reservoir within the eroded remnant of an ancient 100 kilometer diameter impact crater. The ancient crater is very conspicuous from orbit, a visible reminder that Earth is vulnerable to rocks from space. Over 200 million years old, the Manicouagan crater was likely caused by the impact of a rocky body about 5 kilometers in diameter. Currently, there is no known asteroid with a significant probability of impacting Earth in the next century. Each month, NASA’s Planetary Defense Coordination Office releases an update featuring the most recent figures on near-Earth object close approaches, and other facts about comets and asteroids that could pose a potential impact hazard with Earth.