在观测上，天文学家的范围也是有限的。
Astronomers also have a limited range in which to look for them.
现有的天文望远甚至能观测到物质消失在黑洞的景象。
Current telescopes can even see matter disappear into a black hole.
云量观测是天文选址的重要考察项目。
The cloud amount is one of the most important factors in an astronomical site survey.
云量观测是天文选址的重要考察项目。
The cloud amount is one of the most important factors in an astronomical site survey.
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