银河系在三个梅隆后面
(原标题: Milky Way Behind Three Merlons)
2024-08-07
浏览次数: 68
在某些人看来，它们就像城垛，在这里保护我们不受银河系中心的影响。默隆三峰，也被称为拉瓦雷多三峰，今天巍然屹立，因为它们是由致密的白云岩组成的，比周围的软岩石更能抵抗侵蚀。它们形成于大约2.5亿年前，因此在年龄上可以与地球上生命的一次大灭绝相媲美。一个主要的假设是，这次大灭绝是由一颗直径约10公里、比珠穆朗玛峰还大的小行星撞击地球引发的。几个世纪以来，人类一直凝视着银河系及更远的地方，在六分石白云岩（Sexten Dolomites）形成了这些战场般的形状，这是当今和古代天文学家的热门之地。
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To some, they look like battlements, here protecting us against the center of the Milky Way. The Three Merlons, also called the Three Peaks of Lavaredo, stand tall today because they are made of dense dolomite rock which has better resisted erosion than surrounding softer rock. They formed about 250 million years ago and so are comparable in age with one of the great extinctions of life on Earth. A leading hypothesis is that this great extinction was triggered by an asteroid about 10-km across, larger in size than Mount Everest, impacting the Earth. Humans have gazed up at the stars in the Milky Way and beyond for centuries, making these battlefield-like formations, based in the Sexten Dolomites, a popular place for current and ancient astronomers.
© Donato Lioce; Text: Natalia Lewandowska (SUNY Oswego)