COLLECTION NAME:
NASA Astronomy Picture of the Day Collection
Record
Title:
Pwyll: Icy Crater of Europa
Explanation:
The impact crater Pwyll (a name from Celtic Mythology [ http://www.crosslin… ]) is thought to represent one of the youngest features on the surface of Jupiter's moon Europa [ http://antwrp.gsfc.… ]. A combination of color and high resolution black and white data from NASA's Galileo spacecraft [ http://galileo.jpl.… press020408.html ] was used to produce this view looking down [ http://photojournal… PIAGenCatalogPage.pl?PIA01211 ] on the crater with the sun illuminating the scene from the right. Pwyll's visible dark central region is about 26 kilometers in diameter, while brilliant white rays of debris blasted from the impact [ http://photojournal… PIAGenCatalogPage.pl?PIA01175 ] site extend outward for hundreds of kilometers. The white debris or ejecta clearly overlays everything else on the surface - indicating that this impact crater [ http://galileo.jpl.… press011108.html ] is younger than all surrounding features. The bright white color suggests a composition of water ice particles. Galileo's instruments have uncovered substantial evidence that water in liquid form [ http://www.jpl.nasa… ] exists below Europa's icy surface [ http://science.msfc… ast04mar98_1.htm ]. If Europa [ http://www.sciam.co… ] has a subsurface ocean, could it harbor life?
Credit and Copyright:
PIRL [ http://pirlwww.lpl.… ], Galileo Project [ http://galileo.jpl.… ], NASA [ http://www.nasa.gov/ ]
keyword:
crater
facet_where:
Arizona
facet_what:
Crater
UID:
SPD-APOD-ap020413
