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Pwyll (crater)
The impact crater Pwyll (named after the Pwyll of Welsh mythology) is thought to be one of the youngest features on the surface of Jupiter's moon Europa.
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.〔(【引用サイトリンク】url=http://apod.nasa.gov/apod/ap970417.html )〕
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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