Lighttravelsat a speedof 299,792,458 m persecondwhenin a vacuum, whichisfastenoughtocompletelyorbittotheentireearthmorethanseventimesin a singlesecond, whichlookslikethiswhileit's happening.
ThisiswhyinstantcommunicationontheInternetbetweenanytwopeopleontheEarth's surfaceispossiblebecauseEarthis a smallenoughplacewherelightspeedbasicallydoesmeanthesamethingasinstant.
WhentheApolloastronautswerethere, therewas a lagincommunicationbetweenthemandMissionControlbackonEarth, because a messagefromMissionControlwouldtake 1.255 secondstoarrive.
Sointhefuture, whenyou'retryingtocommunicateonFacebookordiscordorwhateveritiswithsomeonelivingonthemoon, you'llhavetowaitatleast 2.6 secondsaftersending a messagetothembeforeyouactuallyget a response.
Sonobodyshouldreallygetupsetafternotgettingreplytofor a whileby a Martian.
だから、火星人からしばらく返信が来なくても、誰も本気で怒るべきではありません。
Thisisgoingtobecome a bigprobleminthefuture, and I suspectit's goingtocausehumancivilizationonMarstograduallyfeelmawrandmawrisolatedandseparatedfromEarth.
Thetimeittakeslighttoreach a JupiterfromEarthisanywherebetween 33 to 53 minutes, meaningthatwhenNASAhas a probeinorbit, theyhavetoewaitforaroundtwohours, sometimesjust a processinformationandsendinstructionstocorrect a potentialnavigationair, meaningthatlightspeedinstructionsaresometimestooslowtoarriveintimetofixtheproblem.
Sojustimaginewhatitwouldbelikeifweeversuccessfullymanagedtogetcolonistsor a probeouton a planet.
想像してみてください、もしも植民者や探査機を惑星に送り出すことに成功したらどうなるでしょうか。
There.
そこだ
A singlemessagebetweenthecolonyandearthwouldtakealmost a decadetoachievebecausethelightsbeingmessagewouldtake 4.24 yearseachway, goingbackandforthtotrulyappreciatehowinsanethatis.
It'lltake 8.5 yearsjusttoget a responsefromsomebodythereafteryousendthem a message.
誰かにメッセージを送った後、そこにいる人から返事をもらうだけでも8年半はかかる。
Ifhumanitieslifeexpectancyremainsaround 80 yearsinthefuture, you'llonlybeabletoshare a maximumofninemessagesinyourentirelifetimewithsomebodywholivesaroundProximaCentauri B.
Wejusthaven't reallydevelopedtothepointyetwhereit's become a majorproblemforus, butitwillhappeneventually, andweneedtobepreparedforitthephysicsoflightorcomplicated.
Andifyou'rethetypeofpersonwithout a lotoffreetimebutwhostillwantstolearnnewthings, youcanset a goaltodoeachoftheirdailychallengesinthosesmall, freemomentsthatyouget.