"According to
--the Milky Way should be surrounded by thousands of tiny satellite galaxies, rather than the mere 25 known ones.
“We see only about 1 per cent of the predicted number of satellite galaxies,” laments Pavel Kroupa of the University of Bonn (Germany).
“We see only about 1 per cent of the predicted number of satellite galaxies,” laments Pavel Kroupa of the University of Bonn (Germany).
And there’s a problem with their location and motion, too—most of the galaxies orbit the Milky Way in an unexpected manner. “It is the cleanest case in which we can see there is something badly wrong with our standard picture [the big bang] of the origin of galaxies,” says Kroupa." CMI