#Illuminating reminds us of some of the colors on Jupiter’s volcanic moon Io: go.nasa.gov/3na1zuN As for #UltimateGrey, the *truly* ultimate grays might be found way out on Pluto’s moon Charon: go.nasa.gov/37am19m twitter.com/NASAOcean/stat… pic.twitter.com/6dRY0nzgc9 https://twitter.com/NASASolarSystem/status/1337482965710880768