giant galaxy clusters

Find the oldest cluster of galaxies
International astronomers announced the discovery of a cluster of galaxies formed in the first phase of the universe more than 13 billion years ago.
The galaxy cluster has three million billion times the mass of the Sun.
El Gordo in Spanish means
Detecting giant galaxy cluster 8.5 billion light-years from Earth
Astronomers have discovered a huge collection of galaxies in the extremely remote region of the universe thanks to NASA's Spitzer space telescope and Wide-field Infrared Survey