Two articles, one published in the journal “Nature” and one in the journal “Astrophysical Journal”, describe the observations of the merger among various starburst galaxies, characterized by a remarkable production of stars. Two teams, led by Tim Miller of Dalhousie University in Canada and Yale University in the USA, and Iván Oteo of the Scottish University of Edinburgh used the ALMA and APEX radio telescopes to study these events which are very ancient as they happened about 1.5 billion years after the Big Bang.