SkyFrameResearch supports and promotes Anthony Longman's EXPAT (expandable rotating shielded space habitat) design concept, as developed with support from NASA's NIAC grant program, and in collaboration with Bob Skelton and his team at Texas A&M University, Joel Sercel at TransAstra Corporation, and Jane Shevtsov at UCLA. Our objective is to realize an expandable structural system that supports development of interior landscape, opening a door for space settlement.
98% of any habitat's mass will be in radiation shielding. Asteroid mining of water for rocket fuel is imminent, & the slag can be used for radiation shielding, including high transparency fused silica wall shielding. Growth from a seed structure to the mature habitat will require decades, but current progress developing asteroid mining is making the deployment of an expandable shielded rotating habitat look like a realizable goal. Click the link below for information on asteroid mining technology.
The structural design of the rotating habitat enables periodic expansion from a small initial seed structure, supporting up to 8,000 people at maturity and an interior ecosystem with lakes and up to 10,000 trees. The habitat will be self-sustaining economically from day one, with incremental expansion avoiding the prohibitive startup costs of full size construction. A 4rpm initial rotation rate reducing to 2rpm at full 224m radius will deliver simulated Earth gravity from 56m radius onwards.