Pickering's Triangle is a filamentary region in the western part of the Veil Nebula in the constellation Cygnus. The Veil is the remnant of a supernova that exploded thousands of years ago, and its thin sheets of gas glow in fine, intertwined threads.
It lies in the northern part of the Veil's western arc, about 2,400 light-years away. The feature is named after Edward Pickering, director of Harvard College Observatory, and was first identified by Williamina Fleming on a photographic plate in 1904. Its delicate, braided structure is among the most intricate in the whole Cygnus Loop.
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Pickering's Triangle
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