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The Solar System includes the Sun and those celestial objects, which are bound to each other by gravitational force in this system. 

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As an ice giant, Uranus does not have a true surface. The planet is mostly a rotating fluid. 

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The Red Planet is very cold, so cold that ice and frost can form not only at the poles. 

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It is a gas giant with an average radius of about nine and a half times that of Earth. It has only one-eighth of Earth's average density 

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NASA scientists have announced that Jupiter's largest moon Ganymede has a vast underground ocean of salt water 

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The Solar System was formed 4.6 billion years ago from a cloud of gas and dust called the Solar Nebula. 

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There are at least 250 to 500 billion stars in the Milky Way - there may be more. There are at least 30 times more stars in the Milky Way than there are on Earth. 

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At one time people thought that the earth was flat. We now know and can prove through satellite images that it is a sphere. 

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On the night of 23 September 1846, astronomers discovered Neptune through a telescope. 

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Yellow clouds made of sulfur cover the entire planet. We can often see it at night. This is usually the first 'star' you will see.