英语听力：自然百科 穿越银河系的旅行 Through Milky Way—32（在线收听） |
A new galaxy is formed where, instead of the discs that the original galaxies have, where all the stars are going around more or less on a plane. Instead the stars are going every which way just like the elliptical galaxies that we see. And so we are pretty sure that this process must be a large/ part of how elliptical galaxies form. The collision of the Milky Way with Andromeda will leave behind a giant elliptical galaxy. Before that happens, there will be one last sight to savor
The image of the Andromeda will be stretched across the sky, looming as big as the Milky Way itself. And it’s conceivable that there would be human beings like ourselves, looking at the sky and seeing this spectacular image.
But would we be the only ones? Or is the galaxy home to other civilizations? It’s time for the final leg of our journey as we search for life inside the Milky Way.
There are around 200 billion stars in our galaxy. But there is only one neighborhood that we know for sure, sustains life.
The sun powers almost everything here on the Earth. It’s the energy source; it’s the engine of life and many other processes. And life here on earth is based heavily on water. And it’s liquid water, it’s the key to life as we know it. And it’s because / liquid water serves as the solvent, the cocktail mixer for the biochemistry of life. |
| 原文地址：http://www.tingroom.com/lesson/zrbaike/2011/260190.html |