Radio images of the L1165-SMM1 binary protostellar system. The locations of the protostars are marked with the crosses in each panel and they are separated by about 100 AU. The left panel is the shorter wavelength data (1.3 mm/230 GHz) taken with the Combined Array For Research in Millimeter-wave Astronomy (CARMA), the middle and right panels show the longer wavelength data (7.3 mm/41 GHz). The left and middle panels have comparable resolutions of 0.33" or 100 AU and the image in the right
panel has 0.1" (30 AU) resolution. For comparison, the orbit of Pluto around the sun has a semi-major axis of 39 AU. The blue and red arrows denote the directions of the outflowing gas from the protostars.
Credit: John Tobin, NRAO/AUI/NSF