Pwyll (crater)
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Pwyll (Template:IPA) is an impact crater on the surface of Jupiter's moon Europa. It is thought to be one of the youngest features on the moon. The crater was first observed from Voyager images in 1986,<ref name="AGU100">Template:Cite journal</ref> and the name was officially recognized by the IAU in 1997, after Pwyll of Welsh mythology.
Description
Pwyll crater is estimated to be 18 million years old or younger.<ref name="Icarus">Template:Cite journal</ref> Its visible dark central region is about Template:Convert in diameter, with several small peaks, and a central peak rising to about Template:Val.<ref>Template:Cite web</ref> Dark material in the center of the crater was exposed as a result of the impact, and may have been excavated from a depth of Template:Val.<ref name="AGU100"/>
Ejected bright material extends outward from Pwyll in rays that extend as far as Template:Val, covering the darker reddish surface of Europa.<ref name="AGU100"/> The bright white color suggests a composition of water ice particles.<ref name=NASAapod41797>Template:Cite APOD</ref> In addition to the white rays, the impact also produced a multitude of smaller secondary craters, which are largest near the center of each ray, and close to the central crater.<ref name="GEM">Template:Cite journal</ref>