Long long ago, people 1 know much about the sun or the earth. They thought that the sun went round the earth. In 2 places, people even said the sun was a god. They thought that the god 3 across the sky every day on a golden horse.

Now 4 the help of scientists, we know that the earth 5 round the sun. It takes the earth a year to go all the way round the 6. Today men know how far it is 7 the earth to the sun. The sun is a star. It 8 much bigger than the earth. It looks smaller only 9 it is too far away. It is too hot for us to reach. Scientists 10 told us that the earth travels a thousand miles on its way round the sun.