On January 25 (Sat.) and 26 (Sun.), 2025, we held an astronomy training for students from Suwa-Seiryo High School and Matsusho-Gakuen High School and Matsumoto-Agatagaoka High School in Nagano Prefecture. They estimated the distance to galaxies from photographs of galaxies and used the recession speeds of these galaxies to determine the age of the universe.
