A Pea galaxy, also referred to as a Pea or Green Pea, is a type of Luminous Blue Compact galaxy which is undergoing very high rates of star formation. Pea Galaxies were first discovered in 2007 by the volunteer users within the forum section of the online astronomy project Galaxy Zoo (GZ). This project seeks to classify up to one million galaxies and has been online since July 2007. Pea galaxies are so-named because of their small size and greenish appearance in the images taken by the Sloan Digital Sky Survey (SDSS) that are used as the database for GZ. One of GZ's founders Kevin Schawinski said, "This is a genuine citizen science project. It's a great example of how a new way of doing Science produced a result that wouldn't have been possible otherwise."
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