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A palimpsest , in planetary astronomy, is an ancient
A palimpsest , in planetary astronomy, is an ancient crater
Crater may refer to:
Landforms
*Impact crater, a depression caused by two celestial bodies impacting each other, such as a meteorite hitting a planet
*Explosion crater, a hole formed in the ground produced by an explosion near or below the surfac ...
that has been degraded over time. They may also be referred to as "ghost craters", "degraded craters", "buried craters", or "pathological craters". Palimpsests have been identified on Mercury, the Earth, the Moon, Mars, Ganymede, Callisto, and possibly even Titan. On Mars, these features are morphologically described as craters that are "flat-floored, rimless, extremely shallow, without central peaks, and would probably represent what remains after erosion."
On an icy moon of the outer Solar System, a palimpsest is a crater whose relief has disappeared due to creep of the icy surface ("viscous relaxation") or subsequent cryovolcanic outpourings, leaving a circular albedo feature, perhaps with a "ghost" of a rim. Icy surfaces of natural satellites like Callisto and Ganymede preserve hints of their history in these rings. A typical example is Memphis Facula
Memphis Facula is a palimpsest, or "ghost crater", on Ganymede, the largest of the Jovian satellites.
About 360 km across, it is situated in the southwestern part of Galileo Regio, a huge almost circular dark region in Ganymede's norther ...
on Ganymede, a 340 km wide palimpsest.
See also
*Palimpsest (geology)
In geology, a palimpsest is a geographical feature composed of superimposed structures created at different times. Palimpsest is beginning to be used by glaciologists to describe contradicting glacial flow indicators, usually consisting of small ...
*Ghost craters on Mercury
Ghost craters on the planet Mercury have tectonic features such as graben and wrinkle ridges. These features were formed by extensional and contractional forces originating in tectonic processes such as uplift and global contraction. The combinati ...
References
{{Reflist, refs = {{cite journal , title=Characterization of palimpsest craters on Mars , last1=Barata , first1=T. , last2=Alves , first2=E. I. , last3=Machado , first3=A. , last4=Barberes , first4=G. A. , journal=Planetary and Space Science , volume=72 , issue=1 , pages=62–69 , date=November 2012 , doi=10.1016/j.pss.2012.09.015 , bibcode=2012P&SS...72...62B {{Cite book , last = Harland , first = D. M. , title = Jupiter Odyssey , publisher = Springer Praxis , edition = 1st , date = 2000-11-10 , pages = 448 (see pp. 136–137) , url = http://google.com/books?id=QtxVTDhrRAEC&pg=PA136 , isbn = 978-1-85233-301-0 , oclc = 44461919 Space science Planetary geology Surface features of bodies of the Solar System Impact craters