Two articles, one published in the journal “Astronomy & Astrophysics” and one in the journal “Monthly Notices of the Royal Astronomical Society”, report various aspects of the discovery of a galaxy protocluster in which there was an extraordinary rate of star formation when the universe was about 3 billion years old. A team of researchers led by Mari Polletta of the Italian National Institute of Astrophysics, Milan, found traces of the protocluster G237.01+42.50, or simply G237, in the data collected by the Planck Surveyor space probe and then used various telescopes to observe the galaxies inside it. The results were collected by a team led by Yusei Koyama of the National Astronomical Observatory, Japan.