SDcamps•演辩营全国英语演讲与辩论赛
Here are some images of clusters of galaxies. 这是一些星团的照片。 They're exactly what they sound like. 正如听上去一样。 They are these huge collections of galaxies, 它们是一堆星系， bound together by their mutual gravity. 由于互相的引力而吸引在一起。 So most of the points that you see on the screen are not individual stars, 你在屏幕上看到的大部分点，不是单独的恒星， bu...
Here is a computer simulation. 这是计算机模拟。 And we need a way to simplify it. 我们需要简化它的方法。 Well, I like to think about this using an analogy. 我会用一个类比来理解。 If I want to understand the sinking of the Titanic, 如果我想了解泰坦尼克号的沉没， the most important thing to do is not to model the little positions of every single little piece of the boat that b...
And many of the questions that we might have about the universe at large scales, 我们关于宇宙在宏观上有很多问题， such as, how does gravity work? 比如，引力是怎么起作用的？ might be answered by studying these systems. 这些问题可能可以通过研究这些系统来解决。 So that was very big. 所以这就是“非常大”。 The second things is very hot. 第二个特点是“非常热”。 Okay, if I take an im...
Here is an image. 这是一张照片。 Since galaxy clusters are representative slices of the universe, scaled-down versions. 因为星团可以看做是宇宙的缩小版。 They are mostly made up of dark matter, 它们也是大部分由暗物质构成， and that's what you see in this bluish purple. 这就是你看到的偏蓝的紫色。 The red represents the hot gas, 红色代表高温气体， and, of course, you can se...