One of a number of small galaxies known to be associated with the
Milky Way spiral. The
Sagittarius Dwarf Galaxy is roughly spheroid in shape, approximately 10,000
light years in
diameter. It is unusual in that appears to be in to process of 'colliding' with our own
Galaxy. This event is taking place at the base of the Outer Arm, on the other side of the
Galaxy from our Sun.