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Dark Grey Planet 01（第1页）

DarkGreyPlanet01

DarkGreyPlanet01

Warm，coldandhotnearthestars，

Fourseasonsofspring，summer，autumnandwinter，

Thebillowingdustlay，

YinandYangallthingsturnintovirtualclouds.

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，

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