一张好的星流迹相片，往往需要一个好的背景衬托，这相片以湖的倒影作背景就是一个十分好的选择。

Usually, a good background is needed for a good star trail photo, in this picture, the stars are reflected through a lake, which is a very nice shot.

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沃尔特·卢因通过APOD向广大天体摄影师发起挑战——拍摄一幅360度星流迹的单曝光晴朗夜空照片。

Walter Lewin, though, has asked APOD to pose this as a challenge to astrophotographers: create a real single-exposure image of a clear night sky that features 360 degree star trails.

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