HINTS： 

全文听写 开头为 I wonder how many planets and 

Pegasus Cluster 

cosmic pond 

on Earth call the Local Group 

Three million【句首不用数字~

I wonder how many planets and how many civilizations might be destroyed. In the Pegasus Cluster there is a ring galaxy, the wreckage left from the collision of two galaxies, a splash in the cosmic pond. Individual galaxies may explode and collide and their constituent stars may blow up as well. In this supernova explosion a single star outshines the rest of its galaxy. We are approaching what astronomers on Earth call the Local Group. Three million light years across, it contains some 20 galaxies. It's a sparse and rather typical chain of islands in the immense cosmic ocean.

这篇材料你能听出多少？点击这里做听写，提高外语水平>>