【名师带你背单词】New Scientist精选《爱因斯坦的宇宙理论》Part2/3,曼拓教育微信公众号文章

Science 是一个另同学们很头痛的话题，不仅因为缺乏science 方面的词汇，而且常常也是因为缺乏这方面的知识储备，导致做题时（特别是听力）理解吃力。针对这个问题，曼拓的资深名师将在每周为大家挑选不同领域的文章，帮助大家增加涉猎。

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New Scientist 精选：《The warps in space that make Einstein’s perfect cosmic accident》Part 2/3

PTE关键词：Galaxy，Einstein，astronomy

来源：https://www.newscientist.com/article/2106168-the-warps-in-space-that-make-einsteins-perfect-cosmic-accident/

核心词汇

掌握了这些单词后，再读一下这看似高深的科学类文章，是不是感觉轻松多了？

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A ring is born

Here’s the ideal scenario. We need a light source: a distant galaxy that is bright all over, not just at its core or in a knot of newly formed stars. We need a lens: another galaxy, a heavy one, which can be far away from the source but must sit directly in front of it along our line of sight.

As general relativity predicts, space sags around the mass of the lens galaxy, making light from the source bend on its way to us. As a result, the lens appears surrounded by multiple images of the background light source.

It’s common to see four distinct images of the source, as if at compass points around the lens, which is called anEinstein cross. In 2015, researchers using the Hubble Space Telescope even saw the same supernova four separate times through this configuration. Partial arcs of light around galaxy clusters are also somewhat common.

But for a true ring, we need the images to blend into each other, completely encircling the lens galaxy.

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