The Ultra Light idea is simple: to radically minimize mass.
These pages make a light presentation of some ideas that are interesting to share. In this way, the reader is invited to identify problems and to formulate their solutions from these beginnings.
At the limit is molecular fabrication, where the composition of atoms and molecules (someday) will deliver possibilities including home printed computers and space craft.
An Ultra Light Space Craft could have a lighter than air mode of atmospheric flight with pressure differential propulsion. The ceiling for this flight mode could be far above normal air traffic, yielding a very desireable safety envelope for ascent and descent. Such a craft would be light and slow in traversing common air space, subsequently accelerating to orbital velocity above the atmospheric mode ceiling.