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darkgreystar
darkgreystar
Theageoftheuniverseis13。8billionyears,andthediameterisabout93billionlight-years
ThePisces-CetusSuperclustercomplexis1billionlight-yearslongand150millionlight-yearswide。
TheLaniakeasupergalaxyhasadiameterof520millionlight-yearsandcontains100,000galaxies。
TheVirgoSuperclusteris100millionlight-yearsindiameterandcontains47,000galaxies。
TheLocalGroupofGalaxiesis10millionlight-yearsindiameterandcontains50galaxies
TheAndromedaGalaxyis220,000light-yearsindiameterandhas1trillionstars。
TheMilkyWayis180,000light-yearsindiameterandhas400billionstars。
Whatistheconceptoflightyear
Commonlyusedunitsinastronomyareparsecs,astronomicalunitsandlightseconds
Anastronomicalunitis149,597,870,700meters
Alightsecondisthedistancetraveledbylightinonesecondandis299,792,458meters。
Alight-yearis9,460,528,177,426。821meters。
Oneparsecequals3。26lightyears
Thespeedoftheearth'smovementaroundthesunis29。79kilometerspersecond,
ThespeedofthesunintheMilkyWayis240kilometerspersecond,
ThespeedoftheMilkyWayintheuniverseis600kilometerspersecond,
TheJunospaceprobehasatopspeedof265,000kilometersperhour,
Itwouldtakeabout4075Earthyearstotraveladistanceof1light-yearwithJuno,
IfJunoweretoflytotheclosesthabitableplanettoEarth,
Ittakes17115EarthyearstoreachProximab,4。2light-yearsaway,
Ittakes48512EarthyearstoreachTiancang5e,whichis11。905light-yearsaway,
Ittakes56,235EarthyearstoreachWolf1061c,whichis13。8light-yearsaway,
Ittakes65199EarthyearstoreachGris832c,whichis16lightyearsaway,
Ittakes83536EarthyearstoreachGris581g,whichis20。5light-yearsaway,
Ittakes92502EarthyearstoreachGris667,whichis22。7light-yearsaway,
ToreachGliese667Ccat24lightyears,itwouldtake97800Earthyears,
ToreachTrapp-1at39。13light-years,itwouldtake159,454Earthyears,
ToHD40307gat42lightyears,itwouldtake171149Earthyears,
Ittakes199,674EarthyearstoreachGris163c,whichis49light-yearsaway,
Ittakes452,325EarthyearstoreachK2-18binLeo,whichis111light-yearsaway,
ToreachKepler438b,whichis470lightyearsaway,itwilltake1915250Earthyears,
ToreachKepler186f,whichis500light-yearsaway,itwilltake2,037,500Earthyears,
Ittakes2,445,000EarthyearstoreachKepler22b,whichis600light-yearsaway,
KOI-4878。01to1075light-years,requires4380624Earth
ToreachKepler62fat1,200light-years,itwouldtake4,890,000Earthyears,
Ittakes5,705,000EarthyearstoreachKepler452b,whichis1,400light-yearsaway,
ToreachKepler69cat2700lightyears,itwilltake11002500Earthyears,
65millionyearsbeforeEarth'sGregorianEra,
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