当车轮旋转时，LED灯形成一个光弧。
宇宙中的巨型光弧是近两年来发现的一种新颖的天象。
Giant luminous arcs, the hitherto unknown types of structures in the Universe, were discovered over past two years.
明年早些时候，卡西尼镜头将会对这段光弧和这颗小卫星做一个更近距离的观测。
Early next year, Cassini's camera will take a closer look at the arc and the moonlet.
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