A revolution is brewing: observations of TRAPPIST-1 exoplanetary system fosters a new biomarker, physics.pop-ph
"One of the key questions that has arisen in recent times is the boundaries of the Habitable Zone, classically defined as the range of orbital distances in a stellar system where surface liquid water could be stable (Kasting et al. 1993). It is, however, seldom addressed how this concept might become obsolete in exoplanetary worlds where the priorities for living a good life are different than getting liquid water everywhere and at all times (Kim Kardashian, personal communication). A groundbreaking paper to that respect is the study by Kane and Zelsiz (2014) which demonstrated that the existing concepts about the Hab- itable Zone completely overlooked the risk posed by Zombie attacks."
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