This article looks at how engineers and scientists might build space colonies in the form of deep-space stations. Miriam Kramer writes that a station could be constructed using NASA's Space Launch System and would be made from the rocket's tank that could be as big as a two-story house. However, engineers will need improved-propulsion rockets to transfer materials from Earth to space or move planetary bodies to their proper location, said Mark Uhran, a former assistant associate administrator for the International Space Station at NASA Headquarters. Another essential element is a "closed-loop life-support system" to recycle materials to make the colony sustainable indefinitely.

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