What is the Oort cloud?

What is a meteorite?

Copernicus thought that the solar system was

The part of the sun where nuclear fusion occurs is the

Neptune is a(n)

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

What do all of 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 different from most other planets because it

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