Radiobios Under Physical Constraints: Radiolytic Survival Limits Near Pulsars and Interstellar Environments

A physically constrained reassessment of the Radiobios hypothesis. This work revisits the original speculative framework of radiation-poweredself-organizing structures in astrophysical environments and tests it againstknown radiolytic efficiencies, thermal limits, replication energetics, andobservational constraints. The analysis shows that most previously proposed environments become physicallyinconsistent under realistic assumptions. The only remaining self-consistentscenario is a slow-evolving ice-based radiolytic structure existing within anarrow survival zone near Crab-like pulsars. The study does not claim discovery of extraterrestrial life. Instead, itdemonstrates how speculative astrobiological hypotheses can be constrainedthrough quantitative physical analysis.