asteroidal

基本解释

Because at least one asteroid appears to be coated by a thin layer of ice. And just that kind of asteroidal frosting could have been the source of our water here on Earth.
现在，《自然》杂志发表的两项研究告诉我们这一观念恐怕是大错特错的，因为我们至少已发现了一颗小行星表面覆盖着一层薄冰，而且只有这种小行星结霜有可能是地球上水的来源。
These rocks are believed to be the result of an asteroidal prang that happened many millions of years ago and left a crater 460km across, which dominates Vesta’s southern hemisphere.
这些岩石据说是几百万年前的小行星碰撞的结果，并在灶神星的南半球形成了一个跨度为460公里的陨石坑。
Because at least one asteroid appears to be coated by a thin layer of ice. And just that kind of asteroidal frosting could have been the source of our water here on Earth.
至少有一个行星被一层薄薄的冰层覆盖，这些冰可能就是地球上水的来源。

As Chick points out: Is the lifetime of our own civilization going to be lengthy enough to be able to solve problems of getting off-world fast enough to survive asteroidal extinction?
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Two thousand years hence, Sherwood says hypothesized collections of Asteroidal materials congregating at the Earth-Sun L4 and L5 gravitational equilibrium points would make for building materials to construct a large rotating pancake disk capable of housing thousands of people in the comfort of a free-breathing atmosphere and some form of artificial gravity.
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