Eric Walker added Orion Hosts a Bizarrely Wonky Protoplanetary System With 3 Stars to Star systems and Atacama Large Millimeter/submillimeter Array (ALMA)

Eric Walker added Planet hop from TRAPPIST-1e – Exoplanet Exploration: Planets Beyond our Solar System and 7 Earth-Size Planets Orbit Dwarf Star, NASA and European Astronomers Say - The New York Times to Trappist-1, and added Trappist-1 to Star systems

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

Eric Walker added a number of topics and a number of links to Galaxies, and added Galaxies to Outer space

Eric Walker added a number of topics and a number of links to Solar system, and added Solar system to Milky Way and Star systems