In context: Astronomers have been observing the wheel-shaped nebula NGC 1514 for over three centuries. In 1790, William Herschel described it as the first deep-sky object that looked cloudy.

In this image from NASA's Spitzer Space Telescope, "cometary knots" on the Helix Nebula show blue-green heads caused by excitation of their molecular material from shocks or ultraviolet radiation.

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