Galaxy clusters are formed by a dense packing of many galaxies, making them the most massive structures in the universe.

The galaxy cluster PLCKG 287.0+32.9, located 5 billion light-years away, exhibits an exceptionally violent collision of three subclusters, characterized by extensive turbulence and shock waves.

Cosmologists have long been on the hunt for dark matter, which makes up 80 percent of the mass in the universe, and yet is still mysterious. As its name suggests, dark matter doesn’t emit light, ...