Disks don't need planets to make patterns, NASA study shows

[unable to retrieve full-text content]Many young stars known to host planets also possess disks containing dust and icy grains, particles produced by collisions among asteroids and comets also orbiting the star. These debris disks often show sharply defined rings or spiral patterns, features that could signal the presence of orbiting planets. Astronomers study the disk features as a way to better understand the physical properties of known planets and possibly uncover new ones.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/~3/KXbctX900is/130713095250.htm

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