Somepeople,inallseriousness,saythat
humanswillbelivinginspacewithinthenext
hundredorsoyears.PlanetEarthwillbecrowded,
dirtyandlackofresources.Asortofexodus--71.
Spaceshipswillbeassembledsothatthey
revolvearoundtheearth.Somemayorbitaround
Mars.Thesespacestationswillbeservicedby
spacebuses.Wesawthefirstspacebuslaunchin--72.
April1981.Thiswas"Columbia",itmadeseveral--73.
orbitsaroundtheearthandthenreturned,landing
onahugedrylakebedinCalifornia."Columbia"
willbeusedagain.previousspaceshipshave
beenabandoned,onlythenoseconebeingused
tobringthecrewsbacktoearth.--74.
Uponestablished,eachspacestationwill--75.
generateitsownatmosphereandhaveitsown
agriculture.itwillneedtorotationtoprovide--76.
anartificialgravity;peoplewillbeforcedinwards--77.
fromthecenterbycentrifugal(向心的)force.
ThemoonandMarscouldbecomenewsourcesof
newmaterials.Drivingthroughspacewillno--78.
longerneedEarthfuel-theenergywouldcome
fromthesun.Thisenergywouldbeconvertedfrom--79.
electricitytoworkmagneticrockets.
Thatallsoundsquietfantasticallybut,with--80.
therapiddevelopmentofmoderntechnology,who
knowsaboutwhatthefutureholds?
80.fantastically--fantastic