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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