See Pierre Teilhard de Chardin, Activation of Energy, trans. René Hague, pp. 99-127. In 1944 Teilhard wrote that the hypothesis of other planets inhabited by intelligent beings has a "positive likelihood," in which case "the phenomenon of life and more particularly the phenomenon of man lose something of their disturbing loneness." (p. 127) There may be many "noospheres" or "thinking planets." "It is almost more than our minds can dare to face," he continues, but the evolutionary tendency toward complexification and centration might well have a "cosmic" scope. Yet "there can still be only a single Omega," that is, a single transcendent Reality whose being enfolds the entire universe. (p. 127)