The Ring Nebula M57 (NGC 6720) in Lyra, seen in a three-color reconstruction from BVR CCD frames taken with the 1.1-meter Hall telescope at Lowell Observatory. The red frame emphasizes H-alpha and {N II} emission; multiple emission lines contribute to both B and V passbands. The blue color of the hot central star is apparent.
Credit: Bill Keel, University of Alabama.
How this image was made: The 3 original narrow-band exposures, and the composit.
Last Modification: February 2, 1998