... DISK т?? ... Study shows disks don't need planets to make patterns . ... This chart compares the gas mass for several debris disk systems and shows where the photoelectric instability is most important. ... These debris disks often show sharply defined rings or spiral patterns, features that could signal the presence of orbiting planets. ... Thanks to interactions between gas and dust, a debris disk may, under the right conditions, produce narrow rings on its own, no planets needed. ... Bead Show | ...