Eric Walker added Planet hop from TRAPPIST-1e – Exoplanet Exploration: Planets Beyond our Solar System to Trappist-1

Eric Walker added 7 Earth-Size Planets Orbit Dwarf Star, NASA and European Astronomers Say - The New York Times to a number of topics

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 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