The Hubble Space Telescope's Advanced Camera for Surveys made these images, which directly show dusty disks around two stars. AU Microscopii (left) lies 32 light-years from Earth. HD 170146 is 88 light-years distant. The blue and red colors in the images provide the size of the dust particles. Blue indicates particles approximately 1/20,000mm in diameter, and red reveals particles 10 times larger, about 1/2,000mm across.