An article accepted for publication in the journal “Astronomy & Astrophysics” describes a research on the galaxy cluster RCS2 J2327-0204, or simply RCS2 J2327. A team of researchers combined observations carried out with the HAWK-I instrument installed on the VLT (Very Large Telescope) and with the Hubble Space Telescope’s ACS instrument to measure the distortions caused by the gravitational lens effects of the cluster estimating its mass in about 2 quadrillion times the Sun’s.