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- Q2330948 subject Q8543134.
- Q2330948 abstract "Van de Graaff is an unusual lunar formation that has the appearance of two merged craters, approximately in a figure-8 shape with no intervening rim separating the two halves. The crater is located on the far side of the Moon, on the northeast edge of Mare Ingenii. The crater Birkeland is attached to the southeast rim, nestling against the slightly narrower "waist" of the formation. To the north is Aitken, and Nassau lies to the east.The outer rim has some terracing along the southwest wall, but is generally in a worn and eroded state. A pair of craterlets overlay the southeast rim, next to Birkeland. There are also several small craters on the interior floor of Van de Graaff. The southwest section has a central peak, while the northeast floor is slightly smoother in form.Orbital studies of the Moon have demonstrated that there is a local magnetic field in the vicinity of this formation that is stronger than the natural lunar field. This is most likely an indication of volcanic rock underneath the surface. The crater also has a slightly higher concentration of radioactive materials than is typical for the lunar surface.The crater walls in the vicinity of Van de Graaff display an unusual grooved texture. This region lies at the antipode of the Mare Imbrium impact site, and it is thought that powerful seismic waves from this event converged at this point. Most likely this energy created the grooved appearance as the tremors triggered landslides, although the grooves may also have been formed by deposited clumps of ejecta from the impact.".
- Q2330948 thumbnail Van_de_Graaff_crater_Birkeland_crater_2033_med.jpg?width=300.
- Q2330948 wikiPageExternalLink lunar.
- Q2330948 wikiPageExternalLink planetarynames.wr.usgs.gov.
- Q2330948 wikiPageExternalLink ch2.htm.
- Q2330948 wikiPageWikiLink Q11408.
- Q2330948 wikiPageWikiLink Q11448.
- Q2330948 wikiPageWikiLink Q116879.
- Q2330948 wikiPageWikiLink Q167903.
- Q2330948 wikiPageWikiLink Q186167.
- Q2330948 wikiPageWikiLink Q193755.
- Q2330948 wikiPageWikiLink Q23548.
- Q2330948 wikiPageWikiLink Q2904506.
- Q2330948 wikiPageWikiLink Q319909.
- Q2330948 wikiPageWikiLink Q3336227.
- Q2330948 wikiPageWikiLink Q333835.
- Q2330948 wikiPageWikiLink Q405.
- Q2330948 wikiPageWikiLink Q410615.
- Q2330948 wikiPageWikiLink Q487895.
- Q2330948 wikiPageWikiLink Q55818.
- Q2330948 wikiPageWikiLink Q8072.
- Q2330948 wikiPageWikiLink Q816838.
- Q2330948 wikiPageWikiLink Q8543134.
- Q2330948 wikiPageWikiLink Q946427.
- Q2330948 comment "Van de Graaff is an unusual lunar formation that has the appearance of two merged craters, approximately in a figure-8 shape with no intervening rim separating the two halves. The crater is located on the far side of the Moon, on the northeast edge of Mare Ingenii. The crater Birkeland is attached to the southeast rim, nestling against the slightly narrower "waist" of the formation.".
- Q2330948 label "Van de Graaff (crater)".
- Q2330948 depiction Van_de_Graaff_crater_Birkeland_crater_2033_med.jpg.