Are We Alone? Galactic Civilization Challenge | Space Time | PBS Digital Studios Are We Alone? Galactic Civilization Challenge | Space Time | PBS Digital Studios begin-post-stats PBS Space Time • 317K views end-post-stats begin-duration 6:22 end-duration Math topics: _Mathematical_objects_##Mathematical objects##_Drake_equation_##Drake equation##_Number_##Number##_1,000,000,000_##1,000,000,000 Other topics: _Search_for_extraterrestrial_intelligence_##Search for extraterrestrial intelligence##_Kepler_(spacecraft)_##Kepler (spacecraft)##_Circumstellar_habitable_zone_##Circumstellar habitable zone##_Frank_Drake_##Frank Drake##_Planets_##Planets##_Terrestrial_planet_##Terrestrial planet##_Planet_##Planet##_Earth_##Earth##_Astronomical_sub-disciplines_##Astronomical sub-disciplines##_Star_formation_##Star formation##_Abiogenesis_##Abiogenesis##_Milky_Way_##Milky Way video-id: BAoEnV3Zt_Q channel_PBS_Space_Time_ So What Learning Astronomical sub-disciplines , Mathematical objects , Planets , Search for extraterrestrial intelligence Monday, January 22, 2018 Share Share