Moving on through the asteroid belt we enter the realms of the gas giant planets: Jupiter, Saturn, Uranus, and Neptune, all of which dwarf the Earth.

穿过小行星带继续前进，我们进入了气体巨行星区域：木星、土星、天王星、海王星，所有这些都使地球看起来像个侏儒。

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Because a few dozen of the meteorites that have fallen to Earth come not from the asteroid belt but from Mars.

因为有几十块落入地球的陨石不是来自于小行星带，而是直接来自火星。

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Earlier studies have shown that the Earth does the same thing with dust released from the asteroid belt.

先前的相关研究表明，地球轨道周围也存在类似的尘埃空洞，其尘埃是来自小行星带的。

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After a million years or so the influence of these large planets, it was thought, caused the fragments to be ejected from the asteroid belt altogether potentially ending up in an Earth-crossing orbit.

ECONOMIST: Celestial mechanics: A rock in a hard place | The

But astronomers have been unable to figure out how they get from the main asteroid belt between Mars and Jupiter to the vicinity of the Earth.

ECONOMIST: Celestial mechanics

Scientists believe it would take an asteroid around 10 million years to travel from the main belt to Earth, so "this doesn't give a Baptistina fragment much time to get into a suitable position", said Dr Mainzer.

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