Free Astronomy Magazine July-August 2020

THE FREE MULTIMEDIA MAGAZINE THAT KEEPS YOU UPDATED ON WHAT IS HAPPENING IN SPACE Bi-monthly magazine of scientific and technical information ✶ July-August 2020 ✶ ✶ The principle of mediocrity and the habitability of galaxies A supernova or Sagittarius – which should we thank? All the planets of Proxima Centauri • ALMA reveals unusual composition of interstellar comet 2I/Borisov • ESO instrument finds closest black hole to Earth • Hubble makes surprising find in the early Universe • SPHERE sees signs of planet birth • METIS instrument passes design milestone