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國際罕見病日是哪天 國際罕見病日海報

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這些引人注目的海報以藝術(shù)的眼光描繪了一些宇宙中最神秘的天文現(xiàn)象

國際罕見病日是哪天 國際罕見病日海報


國際罕見病日海報（國際罕見病日是哪天）
WithHalloweenjustaroundthecorner,NASAhasreleaseditslatestGalaxyofHorrorsposters.Presentedinthestyleofvintagehorrormovieadvertisements,thenewpostersfeaturea"dead"galaxy,anexplosivegammarayburstcausedbycollidingstellarcorpses,andever-elusivedarkmatter;thepostersarealsoavailableinSpanish.
Asfunandcreativeasallthreepostersare,theyrebasedonrealphenomena.Inadeadgalaxy,newstarbirthhasceasedandmostremainingstarsarethelong-livedvariety,whicharesmallandred,givingthegalaxyacrimsonglow.Likewise,whendeadstarscollide,theysometimescreateagammarayburst,orthebrightesttypeofexplosionintheuniverse.AndwhiledarkmattermaysoundlikeitsrightoutofaHalloweentale,itsgravitykeepsstarsinsidegalaxiesandholdgroupsofgalaxiestogetherinclusters–yetscientistsdontknowwhatthisinvisiblestuffismadeof.
【國際罕見病日是哪天 國際罕見病日海報】Freetodownload,theposterswereproducedbyNASAsExoplanetExplorationProgramOffice,locatedatNASAsJetPropulsionLaboratoryinSouthernCalifornia,withtheinputofastrophysicists.ThepostersarealsoavailableinSpanish:CementerioGaláctico,MateriaOscura,andDemonionsdeRayosGamma.
"OneofthethingsIreallylikeaboutthesepostersisthatifyouspendsometimestudyingtheartandthenmaybegolearnalittlemoreabouteachofthesetopics,youllseetherewasalotofthoughtbytheartistsaboutthechoicestheymadetohighlightthescience,"saidJasonRhodes,anastrophysicistatJPLwhoconsultedontheproject.
Takethatdarkmatterposter,whichcarriesthetagline"SomethingElseIsOutThere."Themassivespiderseencrawlingacrosstheskyonaglowingwebispurefiction,buttheconceptalludestosomethingcalledthecosmicweb,whichisthelarge-scaleorganizationofmatteranddarkmatterintheuniverse:Thinfilamentsofmatteranddarkmatterconnectclustersofgalaxies,likeroadwaysbetweenmajorcities.Infact,scientificvisualizationsofthecosmicweblooksimilartothespiderwebfeaturedintheposter.
Similarly,thetwonarrowenergybeamsseeninthegammarayburstposterreflecthowtheyoccurinreallife,travelinginoppositedirectionsfromthecollidingstellarcorpses.Theburstsaresointensethatifsuchaneventoccurred"close"totheEarth,causingabeamtofiredirectlyatourplanet,thebeamofradiationandparticlescoulddoharm.Buttherarityoftheseeventsmakesthatextremelyunlikely,accordingJudyRacusin,anastrophysicistatNASAsGoddardSpaceFlightCenterwhoalsoconsultedontheposters.Infact,astronomersestimatethatagammarayburstgoesoffinourgalaxyonlyaboutonceevery10,000years,buttheyareonlyvisibletousaboutevery10,000,000to100,000,000years.Eventhen,oneoftheseeventswouldntnecessarilyposeathreattoourplanet.
Whilegammarayburstsarereal,thespacetravelersobservingtheeventintheGalaxyofHorrorsimageare,ofcourse,theproductofcreativelicense.
"Theposterartisareallyfunwaytoimagineoneofthesehappening,"saidRacusin."ButIwouldntwanttobethosespacetravelers!"
萬圣節(jié)即將來臨，NASA發(fā)布了最新的恐怖海報 。以經(jīng)典恐怖電影廣告的風(fēng)格呈現(xiàn)，新海報的特色是“死亡”星系、恒星尸體碰撞引起的爆炸性伽馬射線爆發(fā)，以及難以捉摸的暗物質(zhì)；海報也有西班牙語版本 。
盡管這三張海報都很有趣，也很有創(chuàng)意，但它們都是基于真實現(xiàn)象制作的 。在一個死星系中，新恒星的誕生已經(jīng)停止，剩下的大多數(shù)恒星都是長壽命的恒星，它們又小又紅，使星系發(fā)出深紅色的光芒 。類似地，當(dāng)死星碰撞時，它們有時會產(chǎn)生伽馬射線爆發(fā)，或宇宙中最明亮的爆炸 。雖然暗物質(zhì)聽起來像是出自萬圣節(jié)故事，但它的引力將恒星保持在星系內(nèi)，并將星系團聚集在一起——然而科學(xué)家不知道這種無形的物質(zhì)是由什么組成的 。
這些海報免費下載，由位于南加州NASA噴氣推進實驗室的NASA系外行星探索項目辦公室制作，并由天體物理學(xué)家參與制作 。海報也有西班牙語版本：CencerioGaláctico、MaterialaOscura和DemonionsdeRayosGamma 。

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