Pwyll (crater)

Pwyll 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, 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. Its visible dark central region is about 25 km in diameter, with several small peaks, and a central peak rising to about $45 km$. 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 $600 meters$.

Ejected bright material extends outward from Pwyll in rays that extend as far as $1 km$, covering the darker reddish surface of Europa. The bright white color suggests a composition of water ice particles. 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.