At first, astronomers thought it might be a so-called "main belt comet" — a rare case of a comet orbiting in the asteroid belt.
起先，天文学家们认为这种景象不过是所谓的“主带彗星”——即较为少见的轨道在小行星主带内的彗星。
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。
The inner belt orbits at a distance of about 3 astronomical units from its star — or about the same position as the asteroid belt in our own solar system.
内侧行星带距离它的恒星为3个天文单位——或者相当于太阳系中的行星带与太阳的距离。
We will learn about strange objects called comets and asteroids, and about mysterious places like the asteroid Belt, the Kuiper Belt, and the Oort Cloud.
我们将学习彗星和小行星奇怪物体，以及一些神秘的地方，如小行星带，柯伊伯带和奥尔特云。
We will learn about strange objects called comets and asteroids, and about mysterious places like the asteroid Belt, the Kuiper Belt, and the Oort Cloud.
我们将学习彗星和小行星奇怪物体，以及一些神秘的地方，如小行星带，柯伊伯带和奥尔特云。
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