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- Ray_system abstract "A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by small secondary craters formed by larger chunks of ejecta. Ray systems have been identified on the Moon, Mercury, and some moons of the outer planets. Originally it was thought that they existed only on planets or moons lacking an atmosphere, but more recently they've been found on Mars in infrared images taken from orbit by Mars Odyssey's thermal imager.Rays appear at visible, and in some cases infrared wavelengths, when ejecta are made of material with different reflectivity (i.e., albedo) or thermal properties from the surface on which they are deposited. Typically, visible rays have a higher albedo than the surrounding surface. More rarely an impact will excavate low albedo material, for example basaltic-lava deposits on the lunar maria. Thermal rays, as seen on Mars, are especially apparent at night when slopes and shadows do not influence the infrared energy emitted by the Martian surface.The layering of rays across other surface features can be useful as an indicator of the relative age of the impact crater, because over time various processes obliterate the rays. On non-atmosphered bodies such as the Moon, space weathering from exposure to cosmic rays and micrometeorites causes a steady reduction of the differential between the ejecta's albedo and that of the underlying material. Micrometeorites in particular produce a glassy melt in the regolith that lowers the albedo. Rays can also become covered by lava flows, or by other impact craters or ejecta.".
- Ray_system thumbnail Fresh_impact_crater_HiRise_2013.jpg?width=300.
- Ray_system wikiPageExternalLink LunarRays.html.
- Ray_system wikiPageExternalLink default.aspx?c=a&id=2980.
- Ray_system wikiPageExternalLink LunarRays.html..
- Ray_system wikiPageID "898959".
- Ray_system wikiPageLength "5186".
- Ray_system wikiPageOutDegree "41".
- Ray_system wikiPageRevisionID "654128721".
- Ray_system wikiPageWikiLink 2001_Mars_Odyssey.
- Ray_system wikiPageWikiLink Albedo.
- Ray_system wikiPageWikiLink Apollo_16.
- Ray_system wikiPageWikiLink Aristarchus_(crater).
- Ray_system wikiPageWikiLink Atmosphere.
- Ray_system wikiPageWikiLink Basalt.
- Ray_system wikiPageWikiLink Category:Impact_craters.
- Ray_system wikiPageWikiLink Celestial_body_atmosphere.
- Ray_system wikiPageWikiLink Copernicus_(lunar_crater).
- Ray_system wikiPageWikiLink Cosmic_ray.
- Ray_system wikiPageWikiLink Diameter.
- Ray_system wikiPageWikiLink Ejecta.
- Ray_system wikiPageWikiLink Eugene_Merle_Shoemaker.
- Ray_system wikiPageWikiLink Eugene_Shoemaker.
- Ray_system wikiPageWikiLink Far_side_(Moon).
- Ray_system wikiPageWikiLink Far_side_of_the_Moon.
- Ray_system wikiPageWikiLink File:Gratteri.jpg.
- Ray_system wikiPageWikiLink Giordano_Bruno_(crater).
- Ray_system wikiPageWikiLink Impact_crater.
- Ray_system wikiPageWikiLink Iron_oxide.
- Ray_system wikiPageWikiLink Kepler_(lunar_crater).
- Ray_system wikiPageWikiLink Lava.
- Ray_system wikiPageWikiLink Line_(geometry).
- Ray_system wikiPageWikiLink Line_(mathematics).
- Ray_system wikiPageWikiLink List_of_craters_with_ray_systems.
- Ray_system wikiPageWikiLink Lunar_mare.
- Ray_system wikiPageWikiLink Mars.
- Ray_system wikiPageWikiLink Mars_Odyssey.
- Ray_system wikiPageWikiLink Mercury_(planet).
- Ray_system wikiPageWikiLink Meteor.
- Ray_system wikiPageWikiLink Meteoroid.
- Ray_system wikiPageWikiLink Moon.
- Ray_system wikiPageWikiLink Natural_satellite.
- Ray_system wikiPageWikiLink North_Ray_(crater).
- Ray_system wikiPageWikiLink Ohm_(crater).
- Ray_system wikiPageWikiLink Planet.
- Ray_system wikiPageWikiLink Proclus_(crater).
- Ray_system wikiPageWikiLink Regolith.
- Ray_system wikiPageWikiLink Reiner_Gamma.
- Ray_system wikiPageWikiLink South_Ray_(crater).
- Ray_system wikiPageWikiLink Space_weathering.
- Ray_system wikiPageWikiLink Thermal_Emission_Imaging_System.
- Ray_system wikiPageWikiLink Tycho_(crater).
- Ray_system wikiPageWikiLink File:AS15-94-12836.jpg.
- Ray_system wikiPageWikiLink File:Fresh_impact_crater_HiRise_2013.jpg.
- Ray_system wikiPageWikiLinkText "Bright streaks".
- Ray_system wikiPageWikiLinkText "Crater rays".
- Ray_system wikiPageWikiLinkText "Ray material".
- Ray_system wikiPageWikiLinkText "Ray system".
- Ray_system wikiPageWikiLinkText "Ray".
- Ray_system wikiPageWikiLinkText "Rays".
- Ray_system wikiPageWikiLinkText "bright-rayed".
- Ray_system wikiPageWikiLinkText "crater rays".
- Ray_system wikiPageWikiLinkText "ray markings".
- Ray_system wikiPageWikiLinkText "ray material".
- Ray_system wikiPageWikiLinkText "ray streak".
- Ray_system wikiPageWikiLinkText "ray system".
- Ray_system wikiPageWikiLinkText "ray".
- Ray_system wikiPageWikiLinkText "ray-like".
- Ray_system wikiPageWikiLinkText "rayed crater".
- Ray_system wikiPageWikiLinkText "rayed".
- Ray_system wikiPageWikiLinkText "rays".
- Ray_system wikiPageWikiLinkText "system of bright rays".
- Ray_system hasPhotoCollection Ray_system.
- Ray_system wikiPageUsesTemplate Template:Convert.
- Ray_system wikiPageUsesTemplate Template:Coord.
- Ray_system wikiPageUsesTemplate Template:Reflist.
- Ray_system subject Category:Impact_craters.
- Ray_system type Object.
- Ray_system comment "A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by small secondary craters formed by larger chunks of ejecta. Ray systems have been identified on the Moon, Mercury, and some moons of the outer planets.".
- Ray_system label "Ray system".
- Ray_system sameAs Strålesystem.
- Ray_system sameAs Strahlensystem.
- Ray_system sameAs Sädeviiru.
- Ray_system sameAs Structure_rayonnée.
- Ray_system sameAs Raggiera.
- Ray_system sameAs 光条.
- Ray_system sameAs Stralenkrans.
- Ray_system sameAs Strålesystem.
- Ray_system sameAs m.03m_cl.
- Ray_system sameAs Strålsystem.
- Ray_system sameAs Q1478661.
- Ray_system sameAs Q1478661.
- Ray_system sameAs 射紋系統.
- Ray_system wasDerivedFrom Ray_system?oldid=654128721.
- Ray_system depiction Fresh_impact_crater_HiRise_2013.jpg.
- Ray_system isPrimaryTopicOf Ray_system.