Using sophisticated simulations of the whole of the Local Group of galaxies, including the Milky Way, the Andromeda galaxy and their respective satellite galaxies, researchers have shown that the satellites not only can retain their gas but can also experience many new episodes of star formation just after passing close to the pericenter of their parent galaxy.
Click here for original story, Satellite galaxies can carry on forming stars when they pass close to their parent galaxies
Source: ScienceDaily