Difference between revisions 2117893 and 2117894 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.

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Catenae are thought to have been formed by the impact of a body that was broken up by tidal forces into a string of smaller objects following roughly the same orbit. An example of such a tidally disrupted body that was observed prior to its impact on [[Jupiter]] is Comet Shoemaker-Levy 9.

Catenae on [[
Keynote lectures/Mars|Mars]], represent chains of collapse pits associated with grabens (see, for example, the Tithoniae Catenae near Tithonium Chasma).

Crater chains seen on the [[Moon/Keynote lectureSpecial:Search |Moon]] often radiate from larger craters, and in such cases are thought to be either caused by secondary impacts of the larger crater's ejecta or by volcanic venting activity along a rift.<ref name=Apollo>{{ cite book
|url=http://www.hq.nasa.gov/office/pao/History/SP-362/ch5.3.htm
|title=Apollo over  the Moon - Chapter 5: Craters
|accessdate=2008-02-03 }}</ref>
{{clear}}

==Entities==
{{main|Radiation astronomy/Entities|Entities}}
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