Supernova and Cepheids of Spiral Galaxy UGC 9391 and the Expanding Universe
by José Joaquin Galánmiércoles, junio 08, 2016
Hubble Space Telescope image of UGC 9391 Credits: NASA, ESA and A. Riess (STScI/JHU) The Supernova and Cepheids of Spiral Galax...Read More
