Difference between revisions 1816298 and 1843185 on enwikiversity

[[Image:Chain of impact craters on Ganymede.jpg|thumb|right|250px|The image shows a chain of craters on Ganymede. Credit: Galileo Project, Brown University, JPL, NASA.]]
A '''crater''' may be any large, roughly circular, depression or hole in or beneath the rocky surface of a rocky object.

(contracted; show full)|bibcode=2012DPS....4420705L
|doi=
|pmid=
|accessdate=2012-11-02 }}</ref>

==Callisto==
{{main|Callisto}}
[[Image:Valhalla crater on Callisto.jpg|thumb|left|
250px|Multi-ringed impact basin Valhalla on Jupiter's moon Callisto is imaged. Credit: NASA/JPL.]]  
[[Image:Cratered plains PIA00745.jpg|thumb|left|2050px|The ''Galileo'' image of cratered plains illustrates the pervasive local smoothing of Callisto's surface. Credit: .]]
[[Image:Callisto Har PIA01054.jpg|thumb|right|250px|Impact crater Hár has a central dome. Chains of secondary crater]]s from formation of the more recent crater Tindr at upper right crosscut the terrain. Credit: .]]
The surface of Callisto is heavily cratered and extremely old. It does not show any signatures of subsurface processes such as plate tectonics or volcanism, and is thought to have evolved predominantly under the influence of impacts.<ref name=Greeley/> Prominent surface features include multi-ring structures, variously shaped impact craters, and chains of craters (''catenae'') and asso(contracted; show full)[[Category:Astrophysics/Lectures]]
[[Category:Earth sciences/Lectures]]
[[Category:Geography/Lectures]]
[[Category:Geology/Lectures]]
[[Category:Materials sciences/Lectures]]
[[Category:Planetary sciences/Lectures]]
[[Category:Resources last modified in February 2018]]
[[Category:Technology/Lectures]]