英语听力：自然百科穿越银河系的旅行 Through Milky Way—17

We are traveling upwards away from our solar system, out of the spiral arms of the Milky Way. In front of us, lie vast clusters of stars, satellite groups that orbit the heart of our galaxy. These are globular clusters, over 150 have been discovered.

发表于:2019-01-22 / 阅读(329) / 评论(0)

自然百科2011年

英语听力：自然百科穿越银河系的旅行 Through Milky Way—18

Measuring the brightnesses and colors of the stars in the globular cluster, we can figure out how old they are. Here is the remarkable thing: they are very old. Globular clusters, at least the stars in the globular clusters, in many cases, are almost

发表于:2019-01-22 / 阅读(328) / 评论(0)

自然百科2011年

英语听力：自然百科穿越银河系的旅行 Through Milky Way—19

One of the puzzles about our galaxy is that we know that it's had stars forming continuously for about the last ten billion years. But at the rate/ it's eating up its gas now, it's forming new stars, it should burn out that gas soon, should run out o

发表于:2019-01-22 / 阅读(318) / 评论(0)

自然百科2011年

英语听力：2013-10-06 地平线：黑洞吞噬—8

But if you look carefully, stars aren't spread smoothly across the whole sky. They are gathered together into a band that loops around the sky which we call the Milky Way. That bright strip across the sky with its extraordinary abundance of stars and

发表于:2019-01-23 / 阅读(339) / 评论(0)

探索与发现2013年

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