An article published in “The Astronomical Journal” describes a research in which an estimate of the presence of water on the seven planets of the star system TRAPPIST-1 is provided. A team of astronomers led by Vincent Bourrier of the Observatoire de l’Université de Genève, Switzerland, used the Hubble Space Telescope to examine that system concluding that its outer planets are more likely tyo still have a substantial amount of water. They include the three planets in the system’s habitable zone.