Perseus galaxy cluster
The first image of the set showed the Perseus galaxy cluster, a gravitationally bound group of approximately 100,000 galaxies, some of which are up to 10 billion years old. Jean-Charles Cuillandre, a Euclid scientist at CEA Paris-Saclay, explained during the livestream that concentrations of galaxies in the cluster are running along invisible filaments of dark matter, illustrating how Euclid will begin to map parts of the cosmos we cannot directly observe. You can explore the image at its highest resolution in ESASky, an ESA tool that makes it easier to investigate Euclid’s images.
