HOW THE SOLAR SYSTEM WAS FORMED

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• Scientists believe that the solar system was formed when a cloud of gas and dust in space was made, by the explosion of a supernova

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• This explosion made waves in space which squeezed the cloud of gas and dust. Squeezing made the cloud start to fall apart, as gravity pulled the gas and dust together

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• The cloud began to spin as it fell apart. Finally, the cloud grew hotter and denser in the center, with a disk of gas and dust surrounding it was hot in the center but cool at the edges

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• As the disk got thinner and thinner, particles began to stick together and form clumps. Some clumps got bigger, as particles and small clumps stuck to them, eventually forming planets or moons

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• Near the center of the cloud, where planets like Earth formed, only rocky material could stand the great heat. Icy matter settled in the outer regions of the disk, where the giant planets like Jupiter formed

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• The center got so hot that it became a star, the Sun, and blew most of the gas and dust to form the new solar system. By studying parts of rock left over from this early phase of the solar system, scientists have found that the solar system is about 4600 million years old

• What caused the explosion that made waves in space?
• A. Stars B. Supernova. C. Cloud D. Sun
• What squeezed the cloud of dust? A. Clouds B. Sun C. Rocks D. Waves.
• When the cloud fell apart did it come?
• A. Hotter and denser. B. Colder and denser C. Denser D. All of the above