The Outer Planet Atmospheres Legacy (OPAL) program—is a Hubble Space Telescope (HST) imaging program that maps the four giant planets every year. The program cements the long-term legacy of HST by ensuring a regular cadence of giant planet observations to fill temporal gaps between individual programs. The main goal of OPAL is to study long-term trends tied to seasonal or other evolutionary cycles (including storm activity, wind field variability, and changes in aerosols) in the highly dynamic atmospheres of the giant planets.
OPAL logo over planets Uranus, Saturn and Jupiter photographed in different years.
