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1、The Universe,The universe is a huge wide-open space that holds everything from the smallest particle to the biggest galaxy . No one knows just how big the Universe is.,Scientists believe that about 13.7 billion years ago, a powerful explosion called the Big Bang happened. This powerful explosion set
2、 the universe into motion and this motion continues today. Scientists are not yet sure if the motion will stop, change direction, or keep going forever.,There are eight planets in our solar system. Theyre Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.,solar system,And the Earth is
3、 our home. Were living on the Earth, and it is the most beautiful in the solar system. It has lots of water and plants. And the moon is the Earths partner. It goes around the Earth. And other planets are very far from the Earth. So the people cant reach them and none of them has an environment with air. The people also cant live in them.,