![](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Medusa_nebula.jpg/360px-Medusa_nebula.jpg)
Medusa Nebula is a planetary nebula in the constellation of Gemini. It is also known as Abell 21 and Sharpless 2-274. It was originally discovered in 1955 by University of California, Los Angeles astronomer George O. Abell. Image of Medusa nebula from 24 inch telescope on Mt. Lemmon, AZ.