Abell 2744, nicknamed Pandora's Cluster, is a giant galaxy cluster resulting from the simultaneous pile-up of at least four separate, smaller galaxy clusters that took place over a span of 350 million years, and is located approximately 4 billion light years from Earth.

[1] The galaxies in the cluster make up less than five percent of its mass.

[1] The gas (around 20 percent) is so hot that it shines only in X-rays.

[1] Dark matter makes up around 75 percent of the cluster's mass.

[4] Renato Dupke, a member of the team that discovered the Cluster, explained the origin of the name in an interview: "We nicknamed it ‘Pandora's Cluster’ because so many different and strange phenomena were unleashed by the collision.