Their main military base was on Charon (Pluto's moon) with many strongholds in the main asteroid belt.

他们主要的军事基地位在凯伦星 （冥卫一），而且在小行星带曾经有好几座军事要塞。

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It is the first probe to enter orbit around an object in the main asteroid belt between Mars and Jupiter.

它是为进入火星和木星之间的小行星带中环绕一个天体的轨道而进行的第一次探索。

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Recently, scientist have also discovered comets in the main asteroid belt -these main-belt comets might be a key source of water for the inner terrestrial planets.

最近，科学家在主小行星带中也发现了一些彗星——这些主带彗星可能是类地内行星上水的关键来源。

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Vesta and Ceres are the two most massive objects in the main asteroid belt.

CNN: While you were working: An asteroid just flew by

Although downward-looking diagrams of the Main Asteroid Belt make it look incredibly dense, the region has significant gaps, clumps and clusters.

FORBES: Main Asteroid Belt No Remnant Of Exploded Planet

They are believed to have broken away from the main asteroid belt between Mars and Jupiter and are our nearest neighbours in space after the Moon.

BBC: At a glance: Asteroid touchdown