asteroid

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In this case, the orbit of the rotating asteroid will very slowly spiral in toward the sun.
在这样的情况下，旋转小行星的运行轨道将非常缓慢地向朝着太阳的方向盘旋。
Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.
天文学家在距离地球不远处发现一颗与地球绕日轨道相同的小行星。
These findings have led to claims that a 2.5mile long comet or asteroid smashed into the ice sheet covering what is now Canada and the northern US.
这些发现得出了这样一个结论，即2.5英里长的彗星或者小行星猛烈撞击了现今加拿大和美国北部覆盖的冰层。

The American space agency's Dawn spacecraft began circling Vesta, a member of the asteroid belt that orbits the sun.
In two thousand eight Norway opened a so-called doomsday vault designed to be secure from any threat -- even an asteroid strike.
Knowing more about how the Yarkovsky effect changes an asteroid's orbit will help scientists better predict whether RQ36 will come near Earth.

Did an asteroid hit it, blasting the greater part of its atmosphere into space?
NEWYORKER: The Martian Chroniclers

An asteroid is one of the very small planets that move around the sun between Mars and Jupiter.