Amateur astronomer finds petrified surprise near Andromeda Galaxy.
Giuseppe Donatiello detected Pegasus V in historical data from a DOE camera meant to seek for dark energy.
Pegasus V may be a "fossil" of the primordial galaxies, full with ancient stars.
The galaxy was initially seen by the Chilean Vctor M. Blanco 4-meter Telescope. Donatiello was searching for Andromeda dwarf galaxies when he noticed Perseus V.
Scientists suggest that the new galaxy, which contains few heavy elements, must be ancient.