Pwyll's visible dark central region is about 26 kilometers in diameter, with a central peak rising to about 600 meters.
Brilliant rays of debris blasted from the impact site extend outward for hundreds of kilometers. The white debris or ejecta clearly overlays everything else on the surface - indicating that this impact crater is younger than all surrounding features. The bright white color suggests a composition of water ice particles.
The instruments of NASA's Galileo probe uncovered substantial evidence that water in liquid form exists below Europa's icy surface. If Europa has a subsurface ocean, it might also contain life. NASA is considering ways to investigate the habitability of Europa. The proposed 2020 EJSM/Laplace mission is unlikely for budgetary reasons. ESA's planned 2022 launch of Jupiter Icy Moon Explorer would take up that challenge.
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- Wall, Mike (13 December 2012). "NASA Eyes Mission to Jupiter Moon Europa". Space.com. Retrieved 15 December 2012.