Aliens By Fraser Cain - September 10, 2009 12:40 PM UTC | Astrobiology Space Bites+ ▶ Our latest video — free on Patreon Vera Rubin Delivers Even More Discoveries The extended edition: ad-free, with extra content. Free to watch — no account needed. ▶ Watch it free Previous Article ← When Was Mars Discovered? Next Article K-T Boundary →