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Солнечная система

Humans live on a very small planet in an extremely tiny part of an enormously vast universe. This part of the universe is called the solar system, and is primarily dominated by a single brilliant star – the sun. The solar system is the earth’s neighborhood and the planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto are the Earth’s neighbors. They all have absolutely the same stars in the sky and orbit the same sun.

Scientists strongly believe the solar system began about 5 billion years ago, perhaps when a nearby star exploded and caused an unimaginably large cloud of dust and gas to collapse in on itself. The terribly 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 rather hot gas and rocky debris. In the solar system everything is completely affected by the sun’s gravity. The planets and a variety of other objects, including comets, move the way they do totally because of the sun’s gravitational attraction. Our planet, Earth, is the third out from the sun. All of the planets are all greatly different.

We call the planets that are closer to the sun, including the Earth, the inner planets. They are quite small rocky worlds. The outer planets are significantly larger and are made from much lighter materials. All but two planets, Mercury and Venus, have moons in orbit around them.

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