An article published in “The Astrophysical Journal” reports the discovery of a galaxy protocluster dating back to about 13 billion years ago. A team of astronomers led by Yuichi Harikane of the National Astronomical Observatory of Japan (NAOJ), used the Subaru, Keck and Gemini telescopes to find a group of 12 early galaxies including a giant one nicknamed Himiko that form a precursor of today’s galaxy clusters cataloged as z66OD. Its study will help to better understand the evolution of these cosmic structures and the influences among the galaxies that form them, especially the more massive ones.