Astronomers using NASA’s Hubble Space Telescope have weighed the El Gordo Galaxy Cluster – the largest known galaxy cluster in the distant Universe. This composite image shows the galaxy cluster ACT-CL J0102-4915, also known as the El Gordo Galaxy Cluster, the most massive cluster of galaxies ever seen to exist when the Universe was just half of its current age of 13.8 billion years. Image credit: NASA / ESA / J. Jee, University of California,...
