Roger Williamson 
	Hansen Experimental Physics Laboratory, 
	Stanford University, Palo Alto, California, USA
Seth Digel, P. Sreekumar, Jonathan F. Ormes, Igor Moskalenko
	Laboratory for High Energy Astrophysics, NASA, 
	Goddard Space Flight Center, Greenbelt, Maryland, USA

on behalf of the GLAST collaboration

Gamma rays in the band from 30 MeV to 300 GeV, used in combination with data from radio and X-ray bands, provide a powerful tool for studying the origin of cosmic rays in our sister galaxies Andromeda and the Magellenic Clouds. Gamma-ray Large Area Space Telescope (GLAST) will spatially resolve these galaxies and measure the spectrum and intensity of diffuse gamma radiation from the collision of cosmic rays with gas and dust in them. Observations of Andromeda will give an external perspective on a spiral galaxy like the Milky Way. Observations of the Magellanic Clouds will permit a study of cosmic rays in dwarf irregular galaxies, where the confinement is certainly different and the massive star formation rate (in the case of 30 Doradus in the LMC) is much greater.