ITU Tier 1+ #19: Astrobiology (K_astrobio)

Tier 1+ Pass-1.5 paper 19 of 45. ITU-derived astrobiology unifying habitability + biosignatures + Drake equation + SETI. Defines K_astrobio = -log ρ_astrobio as the operator-algebraic modular Hamiltonian on H_planet ⊗ H_chemistry ⊗ H_biosignature ⊗ H_panspermia ⊗ H_drake. K_astrobio inherits from K_QG via the CLPW 2023 type II crossed-product specialised to this scale. Numerical results. Drake equation 1961, JWST exoplanets 2022-, habitable zone, K2-18b 2023.9 DMS controversy, Europa Clipper 2024.10.14. Topics covered. Drake 1961, Kepler 1995 51 Peg b, JWST K2-18b 2023.9 DMS controversy, Europa Clipper launch 2024.10.14, Enceladus, Fermi paradox. 45-vertex polytope #19 top couplings: #10 Climate (0.85), #2 AI (0.85), #11 Cosmo (0.85), #5 Cancer (0.85). Ten falsifiable predictions: P_avg=0.66: arXiv 2026 (0.90 S), Confirmed biosignature 2030 (0.30 W), Mars sample return 2033 (0.55 M). Pass-2 roadmap: ~$1.6M: Astrobio analytics ($500K) + Lean Mathlib ($200K) + JWST+Europa+SETI collab ($900K).