Alone in the Universe ? The Scientific and Philosophical Stakes of Extraterrestrial Life

Abstract The search for extraterrestrial life has become one of the most fertile questions at the crossroads of science and philosophy. This paper explores its scientific, ethical, and cultural dimensions in light of recent advances in astrobiology and exoplanetary science. Beyond the study of biosignatures, space missions to Mars and the icy moons, and exoplanet observations from the James Webb Space Telescope, this investigation calls for a broader reflection on the definition of life and humanity’s place in the cosmos. The analysis is structured around three main axes : 1. The transformation of knowledge into awareness of limits. 2. The philosophical and spiritual implications of discovery, or of cosmic silence. 3. The cultural and symbolic resonance of the theme, illustrated by Pentagon UAP videos, Ummo letters, and The Urantia Book. From this emerges the need for an ethics and philosophy of the cosmos grounded in responsibility, cooperation, and humility. Whether inhabited or silent, the universe compels humanity to reconsider its relationship to life and to itself. Keywords Astrobiology, Exoplanetary Science, Extraterrestrial Life, Philosophy of Science, Cosmic Ethics, Plurality of Worlds, Anthropocentrism, Spirituality, Scientific Imagination, UFO, UAP, Ummo Letters, Cosmophilosophy