7 Earth-Size Planets Orbit Dwarf Star, NASA and European Astronomers Say - The New York Times
https://www.nytimes.com/2017/02/22/science/trappist-1-exoplanets-nasa.htmlPlanet hop from TRAPPIST-1e – Exoplanet Exploration: Planets Beyond our Solar System
https://exoplanets.nasa.gov/resources/2159/planet-hop-from-trappist-1e/