The Medusa is an ancient planetary nebula, representing a dying star that has shed its outer layers, similar to the Dumbbell Nebula and Helix Nebula, but more
distant. It lies 1000-1500 light years away in Gemini. The shell of hydrogen gas, glowing red, is expanded and illuminated by ultraviolet radiation from the central
ember of the fading central star, appearing as a faint blue star in the center of the nebula on this image. The nebula's name is derived from its delicate filaments. The
Medusa Nebula is so faint that it was not even discovered until 1955, by the Yerkes-McDonald survey (and named YM 29), and later designated Abell 21.
This image combined 40 minutes through a clear filter, and 110 minutes red, 80 minutes green, and 110 minutes of blue exposures, all unbinned. An ST2000XM
camera was used through a TEC 140 mm refractor at the Hidden Lake Observatory.
Music: Ruby Tuesday