"Now we have a puzzle," said Stanford astrophysics professor Risa Wechsler, who cofounded SAGA and coauthored all three papers, in a statement. "What in the Milky Way caused these small, lower-mass satellites to have their star formation quenched?"
"Our results show that we cannot constrain models of galaxy formation just to the Milky Way," said Wechsler. "We have to look at that full distribution of similar galaxies across the universe."
"Perhaps, unlike a typical host galaxy, the Milky Way has a unique combination of older satellites that have ceased star formation and newer, active ones... that only recently fell into the Milky Way's domain."
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