Explanation: This spectacular sky is mostly human-made. Once a year, the Light Station at Pigeon Point near San Francisco, California, USA is lit as it was over 100 years ago. During this time, light generated by five kerosene lamps pours through 24 rotating Fresnel lenses, warning approaching ships to stay away. Early last week, light emanating from the Pigeon Point Lighthouse was particularly picturesque because of a thin fog, also blurring the distant Moon. During the latter 1970s, the lighthouse was guarded by an 800 pound pig named Lester. In modern times, the light house is still active but has been supplied with a more efficient flashing aerobeacon.

    图片描述：这震撼人心的景观几乎是人造的。位于加州旧金山附近的鸽子角，有一座灯塔。约一百多前年，它曾经被点亮了一整年。这期间，24枚不停旋转的菲涅尔棱镜，将5盏煤油灯发出的光线反射向远处，提醒来往船只保持距离。上周初，灯塔周围的薄雾四起，灯光显得尤其耀眼，连天边的月亮也暗淡了。上世纪七十年代后期，守卫灯塔的是一只名叫莱斯特，重达800磅的野猪。今天，它依然发挥着作用，只是不再作航运灯塔，而是航空灯塔。

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