Craters form when something from space hits a
planet -- leaving a huge hole (crater) where it
crashes on the planet's surface. On the
terrestrial planets (Mars, Earth, Venus and
Mercury) we can see the physical crater, because
it is a huge dent in the planet's surface. But
on gas planets, there is no hard surface for
the crater to form on because the planet is all
made of gas!
Although we can't see craters on the gas planets,
we can see craters on some of their moons (which
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