Obtaining observing time on one of the newer, more powerful 8-meter telescopes or on the HST was, and remains, more challenging.

对于获得更新更大的8米级望远镜或者哈勃太空望远镜的观测时间仍具有挑战性。

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And even if astronomers have some inkling that an explosion is imminent, they still must arrange observing time or frantically search for an available telescope in proper position.

即使天文学家们隐约地意识到爆炸即将来临，他们仍然必须安排观测时间，或者不得不去疯狂地搜寻处于合适观测位置的可利用望远镜。

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There were 6 rats in every group at each observing time.

每组每个时间点的动物数为6只。

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He decided to spend more time observing the planet Mars.

VOA: special.2010.07.11

A navigator can know the latitude of his ship by observing the location of stars, where the sun rises in the morning and sets in the evening, and what time of year it is.

VOA: special.2010.07.14

Another factor is the intense competition for observing time on the world's largest telescopes.

ECONOMIST: Mining the digital skies

It started in 2010 and was granted a total of 1929 hours of observing time over a five-year period.

ENGADGET: 9-gigapixel image of the Milky Way reminds us just how small we truly are

On average, less than a quarter of applications for observing time succeed.

ECONOMIST: Mining the digital skies