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Keynote lectures/Craters by radiation
[[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.

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==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|250px|The ''Galileo'' image of cratered plains illustrates the pervasive local smoothing of Callisto's surface. Credit: .]]
(contracted; show full)[[Category:Earth sciences/Lectures]]
[[Category:Geography/Lectures]]
[[Category:Geology/Lectures]]
[[Category:Materials sciences/Lectures]]
[[Category:Planetary sciences/Lectures]]
[[Category:Radiation/Lectures]]
[[Category:Radiation astronomy/Lectures]]
[[Category:Resources last modified in November 2018]]