![Transit of Mercury across the face of the Sun, a composite of five separate images in ultraviolet …[Credits : NASA/TRACE/SMEX]](http://media-2.web.britannica.com/eb-media/05/76805-004-86EFBF13.jpg)
Transit of Mercury across the face of the Sun, a composite of five separate images in ultraviolet light taken by the Transition Region and Coronal Explorer (TRACE) satellite in Earth orbit, November 15, 1999. The time interval between successive images is about seven minutes.
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