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Including a tiny moon just recently spotted by astronomers .

包括一颗最近才被天文学家发现的新卫星。

It is one of the best examples of a planetary nebula and a favorite target of amateur astronomers .

它是行星状星云的最好范例之一，也是业余天文爱好者最喜欢观测的目标之一。

Late in 2004 astronomers made an alarming discovery .

宇航员们2004年岁末的发现搞得人心惶惶。

The planet is not nearly as calm as astronomers thought .

天王星远远不像天文学家们原以为的那么平静。

And the question of age becomes pretty important as astronomers seek out potentially habitable planets orbiting distant stars .

当天文学家在找出遥远群星中有潜在可居住性的行星时，星体的年龄问题则变得相当重要。