单词：globular jointing
单词：globular jointing 相关文章
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.
自然百科2011年
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
自然百科2011年
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
自然百科2011年
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
探索与发现2013年
第一部分、写作步骤 要求考生从正反两个方面来论证某一观点，如2000年6月四级作文、1996年6月四六级作文、1996年1月英语四六级作文。对这类题型，通常分为四个步骤来写： 第一段、文章开头
四六级写作指导
通过分析历年作文真题可以发现，cet/ target=_blank class=bule英语四六级作文的考试题型大概可以分为这5个方面：A、阐述主题题型、B、正反观点题型、C、英文信函题型、D、记叙文题型、E、图表题
四六级写作指导