El Gordo on a diet The galaxy cluster is aptly named after its behemoth mass — it weighs in at about 2.1 quadrillion solar masses (try writing 2 with 15 zeros after to see just how large that ...

The most massive galaxy cluster ever observed in the early universe is quite a bit bigger than astronomers had thought. New measurements by NASA's Hubble Space Telescope suggest that the cluster ...

Astronomers have found the largest known galaxy cluster in the ancient Universe, calling it "El Gordo" - Spanish for "the Fat One".

El Gordo is a massive collection of colliding galaxies 7 billion light-years away. Its odd behavior could mean dark matter interacts with itself, challenging the standard model of cosmology.