机译:Galactic traversability: a new concept for extragalactic SETI
Univ Calif Berkeley;
Search for extraterrestrial intelligence; interstellar travel; galaxies; interstellar medium; EARLY-TYPE GALAXIES; ALPHA-EMITTING GALAXIES; MOLECULAR GAS CONTENT; X-RAY-EMISSION; STAR-FORMATION; COSMIC-RAY; MILKY-WAY; INTERSTELLAR-MEDIUM; ELLIPTIC GALAXIES; ATLAS(3D) PROJECT;