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The Solar System
The Solar System The Solar System Humans live on a small planet in a tiny part of a vast universe. This part of the universe is called the solar system, and is dominated by a single brilliant star-the sun. The solar system is the earth’s neighbourhood and the planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto are the Earth’s neighbours. They all have the same stars in the sky and orbit the same sun. Scientists believe the solar system began about 5 billion years ago, perhaps when a nearby star exploded and caused a large cloud of dust and gas to collapse in on itself. The hot, central part of the cloud became the sun, while some smaller pieces formed around it and became the planets. Other fragments became asteroids and comets, which also orbit the sun. The early solar system was a turbulent mix of hot gas and rocky debris. In the solar system everything is affected by the sun’s gravity. The planets and a variety of other objects, including comets, move the way they do because of the sun’s gravitational attraction. Our planet, Earth, is the third out from the sun. The planets are all different. Their differences are largely the sun, planet, moon, earth, mercury, pluto, water, planets, neptune, very, ice, craters, orbit, large, astronomers, system, surface, solar, out, air, temperature, sky, discovered, closer, around, two, space, size, rocky, oxygen, one, much, mainly, made, life, just
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