Earth, Mars, Mercury, and Venus are known as the

Uranus, Saturn, Neptune, and Jupiter are known as the

Which planets are mostly composed of gases?

Which planets are mostly composed of rocky materials?

The terrestrial planets and giant planets are separated by the

Comets with a long-period originate in the

Short-period comets originate in the

A falling or shooting star is really a

When a meteoroid strikes the Earth it is called a

Which planet is largest?

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