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The problem of the extent of habitable zones in different kinds of galaxiesis one of the outstanding challenges for contemporary astrobiology. In thepresent study, we investigate habitability in a large sample of simulatedgalaxies from the Illustris Project in order to at least roughly quantify thehospitality to life of different galactic types. The pioneering study of Dayalet al. (2015) is critically examined and some of its results are amended. Inparticular, we find a tentative evidence for a second mode of galactichabitability comprising metal-rich dwarfs similar to IC 225, LMC or M32. Therole of the galactic environment and the observation selection effects isbriefly discussed and prospects for further research on the topic outlined.

Galactic Habitability Re-Examined: Indications of Bimodality