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Solar System

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laxy. Almost the whole galaxy is made of stars. Astronomers believe there are at least 100 billion stars. If you counted one star a second it would take you more than thirty thousand years to count 100 billion. And each star has planets, like the sun. Sun. The big burning ball of gas that holds nine major planets in orbit is not unlike many stars in the universe. The Sun makes up 99.86 percent of the solar system's mass and provides the energy that both sustains and endangers us. Scientists have lately begun calling its tremendous outpouring of energy "space weather." Massive

Название: Solar System
Дата публикации: 2004-10-10

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