A single realization of the habitability of extrasolar planets over time. Samuel Arbesman Gregory Laughlin 10.1371/journal.pone.0013061.g003 https://plos.figshare.com/articles/figure/_A_single_realization_of_the_habitability_of_extrasolar_planets_over_time_/496357 <p> values for the extrasolar planets are plotted, with those of the upper envelope (maximum for a given year of discovery) indicated in black. The black curve is the logistic best-fit curve of the upper envelope, using a nonlinear model, where and . The horizontal grey line indicates the maximum value of , the presence of an Earth-like habitable planet.</p> 2013-02-20 23:01:45 realization habitability extrasolar planets