Images obtained with the Jeanne Rich (HERON) and William Herschel (WHT) telescopes, in which we can see the Giant Coma stream, a stellar stream (dark line) ten times longer than the size of the Milky Way and which flows  between galaxies (in colour) 300 million light-years away. Credit: HERON/ WHT/ Román et al. Design: Inés Bonet (IAC)