Pea galaxy
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A Pea galaxy, also referred to as a Pea or Green Pea, might be a type of luminous blue compact galaxy that is undergoing very high rates of star formation. Pea galaxies are so-named because of their small size and greenish appearance in the images taken by the Sloan Digital Sky Survey (SDSS).
Galaxy Zoo Green Peas
Three Hubble Space Telescope pictures of Green Peas
A Hubble Space Telescope Cosmic Origins Spectrograph Near-UV image of Pea galaxy GP_J1219.
GP Spectra indicating the resonant scattering of Lyα photons.
Starburst galaxy
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A starburst galaxy is one undergoing an exceptionally high rate of star formation, as compared to the long-term average rate of star formation in the galaxy, or the star formation rate observed in most other galaxies.
The Antennae Galaxies are an example of a starburst galaxy occurring from the collision of NGC 4038/NGC 4039. Credit: NASA/ESA.
Light and dust in a nearby starburst galaxy
Artist's impression of a galaxy undergoing a starburst.
SBS 1415+437 is a WR galaxy located about 45 million light-years from Earth.