We are the people working out how to leave.
Obsidian Expanse is a community of engineers, scientists, and builders working through the open problems of star colonization — in public, one thread at a time.
Open problems, being worked right now
Propulsion
Fusion torches, solar sails, and the physics of getting mass to a meaningful fraction of light speed.
Habitats
Closed-loop life support, radiation shielding, and the engineering of places people can actually live.
Astrogation
Candidate systems, exoplanet surveys, and the trajectory math for getting there.