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The term faint blue galaxy (FBG) refers to galaxies that have a low bolometric magnitude and a blue color that showed up in surveys far more than expected, presenting the faint blue galaxy problem, the mystery of why there are so many. The initial problem seemed explained when supernova survey results revealed an excess of distant Type Ia supernovae, and the resulting theory of dark energy explained both excesses. However, subsequent surveys have revealed more such galaxies at high redshift. The most likely assumption now is that they are dwarf galaxies undergoing considerable star formation and that the large number has been reduced at lower redshifts through galaxy mergers.