A Green Pea galaxy is a galaxy that is
undergoing high rates of star formation. Astronomers believe that they
might be a type of Blue Compact Galaxy. They are named Green Pea
galaxies because they appear very small in size and they look
greenish.
These galaxies where discovered in
2007, by a couple of volunteer astronomers. They were discovered at
redshifts between 0.112 and 0.360. The galaxies are very compact and
emit a lot of lines from oxygen. The biggest these galaxies get is
around 16,000 light years or 5,000 pc. So the Milky Way is about
6.25 times as big as a Green Pea galaxy. Here is an image of a Green Pea galaxy:
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