eextremely powerful telescope. He made two mind-boggling (unbelievable) discoveries.

　　First, Hubble figured out that the Milky Way isn't the only galaxy. He realized that faint, cloud-like objects in the night sky are actually other galaxies far, far away. The Milky Way is just one of billions of galaxies.

　　Second, Hubble discovered that the ggalaxies are constantly moving away from each other. In other words, the universe is expanding. The biggest thing that we know about is getting bigger all the time.

　　A few years later, Belgian astronomer Georges Lemaitre used Hubble's amazing discoveries to suggest an answer to a big astronomy question: "How did the universe begin?"

3．Skim the text and identify the difficult sentences of each paragraph. You may put your hand up if you have any questions.

4. Reading and transferring information

Read the text again to complete the table below,

HOW LIFE BEGAN ON THE EARTH What was the earth like after the "Big Bang"? Why was the earth different? How was life developed on earth? What did small clever animals do? 【Keys】