The High Frontier: Human Colonies in Space

acceleration antenna Apollo Apollo 12 asteroid belt astronauts atmosphere build built century chemical climate concept construction cylinder decades dollars early Earth Earth-normal economic efficiency electric engine environment Eric Drexler estimates flight fraction fuel geosynchronous orbit gravity growing growth Henry Kolm High Frontier humanization of space hundred increase industry Island Three land area launch lift costs limits living located low orbit lunar materials lunar surface magnetic mass-driver ment meteoroid miles million mirrors Moon NASA nations nuclear operation oxygen payload percent perhaps plants population population density possible power satellites power stations Princeton problem radiation reaction mass require rocket rotation seems shielding shuttle solar energy solar power solar power satellites solar system space colonies space communities space habitat space manufacturing Space Studies Institute speed sphere SSPS sunlight sunshine thousand tion tons transport Tsiolkowsky vehicle velocity zero-gravity