https://www.nasa.gov/ames-ocs/ocs-seminars/kelvin-long/
Kelvin Long: Interstellar Flight And Seti In Galactic Civilizations - NASA
Since the emergence of civilization, humanity has looked to the stars and wondered if we are alone in the universe. Kelvin Long examined some of the proposed...
kelvin longinterstellar flightgalactic civilizationssetinasa