ASTRONOMY:
Dust Disks May Point Way to Exoplanets
Govert Schilling
UTRECHT, THE NETHERLANDS--Astronomers have traditionally believed that the formation of planets would leave little or no dust around a star because all the dust would end up in planets; a disk of dust, they thought, was a sign that no planets had formed in that particular system. But researchers have now found a dust disk around 55 Cancri, a dim, sunlike star in the constellation Cancer that is thought to be accompanied by one or possibly two massive planets. Apparently, dust disks and planets are not mutually exclusive after all.