Do you know about the Big Bang? 你了解宇宙大爆炸吗？

　　The Big Bang was the beginning of the universe. 宇宙大爆炸是宇宙的开端。

　　The Big Bang happened at least 13.73 billion years ago. 它至少发生在一百三十七亿三千万年前。

　　Scientists believe that the older stars are 13.73 billion years old. 科学家相信古老的星球都有一百三十七亿三千万岁了。

　　And they think that the stars were born immediately after the Big Bang. 他们认为大爆炸之后星球就立即产生了。

　　Before the Big Bang, there was a small universe. 在大爆炸之前有一个小宇宙。

　　Then the Big Bang created a huge amount of energy into the universe. 大爆炸创造了大量能量注入到宇宙中。

　　So the universe became bigger and bigger. 所以，宇宙变得越来越广阔。

　　In fact, the universe is still growing. 事实上，宇宙仍在增大。

　　Nobody knows what made the universe, but now we know that the Big Bang made it large. 没有人知道什么创造了宇宙，但我们现在知道大爆炸使它变大了。