For thousands of years, people thought Earth was at the ____ of the Universe. The black ____ is at the centre of the Solar System. The Sun is a comet, or a huge ball of hot ____. Our sun is 4.6 ____ years old. Pluto used to be the ninth planet until ____. ____ is the only planet on which plants and animals live. Between Mars and Jupiter, there is an asteroid ____. The ____ Solar System is a part of the Milky Way cluster. There are more than 100 million ____ in the part of the universe which we can see. Our ____ can live for another 10 million years.

Our Universe

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