The millennial project: colonizing the galaxy-- in 8 easy steps

accelerate algae amount anti-matter Aquarian Aquarius Asgard asteroid belt atmosphere atomic Avallon average beam Bifrost Bridge bubble carbon carbonaceous chondrites civilization cloud colonists comets cosmic cost crater create cubic deep water density diameter dome Dyson Earth ecosphere electrical electron energy engineering environment equator fuel galaxy gravity growth habitats heat human hydrogen inside interstellar kilogram kilometers laser Laser Propulsion launch capsule launch tube living lunar magnesium mariculture marine colonies Mars Martian mass materials megawatts membrane meteoroids meters Millennial Millennium Moon nitrogen nutrients oceans Oort cloud orbit OTEC outer oxygen payload Phobos planet planetary platform population pressure produce propellant protein radiation require Rigil rocket sea water seed ship solar system Solaria space colonies speed of light sphere Spirulina star structure surface temperature terraformed thousand tons trillion universe vapor virtually water shield York