What is the Oort cloud?

What is a meteorite?

Copernicus thought the solar system was

The part of the Sun where nuclear fusion occurs is the

Neptune is

The region between Mars and Jupiter where many rocky objects are found is the

What do all off the inner planets have in common?

Venus and Earth are much alike in terms of

Earth is unique among the planets because of

Uranus is unique among the planets because it

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