In 1936, astronomers saw a puzzling event in the constellation Orion: the young star FU Orionis (FU Ori) became a hundred times brighter in a matter of months. At its peak, FU Ori was intrinsically 100 times brighter than our sun. Unlike an exploding star, though, it has declined in luminosity only languidly since then.
Hubble finds sizzling details about young star FU Orionis
