Dust rings around HR 8799
ALMA image of dusty cometary ring around HR 8799, the only star where multiple planets have been imaged. The new data suggest the planets either migrated or another undiscovered planet is present. The zoom-in portion of the image, taken with ESO's Very Large Telescope, shows the location of the known planets in this system in relation to a graphical representation of the central star.
See "Cometary Belt around Distant Multi-Planet System Hints at Hidden or Wandering Planets " for the details.
Credit: Booth et al., ALMA (NRAO/ESO/NAOJ); A. Zurlo, et al