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                          极速赛车计划115

                          极速赛车计划115

                          2019-04-15 16:48:32

                          字体:标准

                          First image of a black hole captured: astronomers#标题分割#PhotoprovidedbytheEventHorizonTelescope(EHT)showsthefirstimageofablackhole.(Xinhua/EHT)AstronomerssaidWednesdaythattheycapturedthefirstimageofablackhole,unveilingthefirstdirectvisualevidenceofanunseeablecosmicobjectanditsshadow.AnEarth-sizedvirtualtelescopecalledEventHorizonTelescope(EHT)linkingeightground-basedradiotelescopesaroundtheglobe"saw"theblackholeatthecenterofmassivegalaxyM87,55millionlight-yearsfromEarthwithamass6.5-billiontimesthatoftheSun.Atapressconference,scientistsrevealedadonut-likestructurewithadarkcentralregionandabrightring,whichistheblackhole'sshadowagainstadiscofglowinggasthatfallsontotheblackhole.Itisa"surprising"finding,an"astonishment"and"wonder,"HarvardastrophysicistSheperdDoeleman,EHT'sprojectdirector,describedtheimage,whosereleasewonimmediateapplauseattheconference.ThelandmarkresultoffersscientistsanewwaytostudythemostextremeobjectsintheuniversepredictedbyAlbertEinstein'sgeneralrelativity.BlackholesareextremelycompressedcosmicobjectspredictedbyEinstein'stheoryofgeneralrelativity.Ithasagravitationalpullthatissointensethatnothing,notevenlight,canescapeitonceinsideacertainregioncalledtheeventhorizon.JasonDexter,EHTteammemberandanastrophysicistwithMaxPlanckInstituteforExtraterrestrialPhysics,toldXinhuathatthesizeandshapeoftheshadoware"apredictionofgeneralrelativityanddetectingitwouldbethebestevidencefortheexistenceofablackholeintheuniverse.""Ifimmersedinabrightregion,likeadiscofglowinggas,weexpectablackholetocreateadarkregionsimilartoashadow,"saidchairoftheEHTScienceCouncilHeinoFalckewithRadboudUniversity."Thisshadow,causedbythegravitationalbendingandcaptureoflightbytheeventhorizonallowedustomeasuretheenormousmassofM87'sblackhole,"saidFalcke."Manyofthefeaturesoftheobservedimagematchourtheoreticalunderstandingsurprisinglywell,"saidPaulT.P.Ho,EHTBoardmemberandDirectoroftheEastAsianObservatory.Ateamofmorethan200scientistsincludingChineseastronomersworkedtocaptureanddeveloptheimage,thankstoaglobalnetworkofeightpre-existingtelescopes,accordingtoEHT.DanMarrone,EHTco-investigatorandanassociateprofessorofAstronomyattheUniversityofArizona,toldXinhuaafterthepressconferencethatChinamadedirectcontributiontotheobservationsanddataanalysisaswell,whichareimportantpieceofit.SeraMarkoff,amemberofEHTScienceCouncilandaprofessorattheUniversityofAmsterdam,toldXinhuathatsheexpectedtohaveaChinesetelescopeincludedintotheEHTnetwork,since"Chinaisinvestinganenormousamountofmoneyintonewtelescopefacilities.""Breakthroughsintechnologyandthecompletionofnewradiotelescopesoverthepastdecadeenabledourteamtoassemblethisnewinstrument,designedtoseetheunseeable,"saidDoeleman."Adirectobservationofblackholewillbetremendousforourunderstandingofthespacetimethatwearein,"YauShing-Tung,mathematicianandaseniorfacultymemberofHarvard'sBlackHoleInitiative,toldXinhua.

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