NASA had repaired the telescope four times before, for mostly minor fixes.

之前，美国国家航空航天局也对这台望远镜进行过四次维修，但大多只是小修小补。

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Observatories around the world send their findings to the NASA-funded Minor Planet Center, which keeps a database of all known asteroids and comets in our solar system.

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Apart from "a few minor dings" in some thermal protection tiles, Nasa officials have said there does not seem to be any cause for concern.

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Nasa said three of the science instruments on Cassini were suffering from minor ailments, but the impact on data gathering was minimal.

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