Eric Walker added Alpha Centauri - Wikipedia to Alpha Centauri

Eric Walker added Gravity, Gizmos, and a Grand Theory of Interstellar Travel | WIRED to a number of topics

Eric Walker added Alpha Centauri - Wikipedia and Gravity, Gizmos, and a Grand Theory of Interstellar Travel | WIRED to Alpha Centauri, and added Alpha Centauri to Star systems

Eric Walker added Solar system, Trappist-1 and Alpha Centauri and Orion Hosts a Bizarrely Wonky Protoplanetary System With 3 Stars to Star systems, and added Star systems to Galaxies