A protostar in our galaxy may give rise to a solar system in which the planets orbit in different directions, unlike our own solar system, whose planets all rotate in the same direction. The star, located some 500 light-years away in the direction of the Ophiuchus constellation, is encircled by a disk of the material from which planets form. The inner and outer parts of the disk are orbiting in opposite directions--the first time such counter-rotation has been observed in the disk around a young star. Astronomers speculate that the star and disk material may have come from two different prestellar clouds that were rotating in opposite directions. A report detailing the findings will be published in the April 1 Astrophysical Journal.