MESSENGER has revealed that Caloris is filled with smooth plains that are brighter than the surrounding terrain, hinting at a compositional contrast between these geologic units. (solarviews.com)
Leather Seats, All Wheel Drive, LIGHT GRAY; SMOOTH PLAIN LEATHER SEAT TRIM, SMOKY GRANITE MICAThis vehicle is Guaranteed to be RECALL FREE. (shoppok.com)
But in 2008, Messenger also discovered smooth plains indicative of ancient lava floods. (newscientist.com)