If we are confronted with galaxies, then we should not trust the size indicators. Some large-scale galaxies are dormant, but dwarf, like ESO 553-46, are able to activate an incredibly rapid stellar birth. Among the nearest 1000 galaxies, ESO 553-46 has the highest rate of formation of new stars. But this is absolutely baby!
Clusters of young hot stars literally tear apart galactic space with a powerful glow. Radiation lines ignite the gas, and the galaxy glows red. Because of their low mass and bright color, scientists sent her to the class of blue compact dwarfs.
It does not have a clear core and structure, than large brothers like the Milky Way can boast. But researchers are interested in its chemical composition, as it contains a small dusty part and several elements heavier than helium created in supernova explosions. These conditions remarkably accurately replicate the situation in the early Universe.