NASA’s Chandra Finds Largest Galaxy Cluster in Early Universe; 

- El Gordo (ACT-CL J0102-4915)

• Scientists used Chandra and optical telescopes to discover El Gordo some 7 billion light years away and study its properties.


• It is the most massive, the hottest, and gives off more X-rays than known cluster at its distance or beyond.


• El Gordo is actually the site of two galaxy clusters colliding, making it a younger cousin to the well-known Bullet Cluster.

Credit: NASA / Chandra Observatory