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Stelarwindandefects Stelarwindandefects ThroughtheOrionNebulato.. TheOrionNebulaisoneof themostscrutinizedand

Thenebulaisvisiblewiththenakedeyeevenfrom areas afectedbysomelightpolution.Itisseenasthemiddle"star"in the"sword"ofOrion,whicharethethreestarslocatedsouthof Orion'sBelt.Thestarappearsfuzytosharp-eyedobservers, andthenebulosityisobviousthroughbinocularsorasmal telescope.Thepeaksurfacebrightnessofthecentralregionis about17Mag/arcsec2(about14milinits)andtheouterbluish glowhasapeaksurfacebrightnessof21.3Mag/arcsec2(about 0.27milinits).Inthephotosshownherethebrightness,or luminance,isenhancedbyalargefactor. Observershavelongnotedadistinctivegreenishtinttothe nebula,inadditiontoregionsofredandofblue-violet. TheredhueisaresultoftheH╬▒recombinationlineradiationat awavelengthof656.3nm. Theblue-violetcolorationisthereflectedradiationfrom the massiveO-classstarsatthecoreofthenebula.

photographedobjectsinthe nightsky,andisamongthe mostintenselystudied celestialfeatures.Thenebula hasrevealedmuchaboutthe processofhowstarsand planetarysystemsare formedfromcolapsing cloudsofgasanddust.

AnimatedtouroftheOrionNebula TheBeautyofSpace

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