  Searches for extrasolar planets have uncovered an astonishing diversity of
planetary systems, yet the frequency of solar system analogs remains unknown.
The gravitational microlensing planet search method is potentially sensitive to
multiple-planet systems containing analogs of all the solar system planets
except Mercury. We report the detection of a multiple-planet system with
microlensing. We identify two planets with masses of ~0.71 and ~0.27 times the
mass of Jupiter and orbital separations of ~2.3 and ~4.6 astronomical units
orbiting a primary star of mass ~0.50 solar masses at a distance of ~1.5
kiloparsecs. This system resembles a scaled version of our solar system in that
the mass ratio, separation ratio, and equilibrium temperatures of the planets
are similar to those of Jupiter and Saturn. These planets could not have been
detected with other techniques; their discovery from only six confirmed
microlensing planet detections suggests that solar system analogs may be
common.
