See views of The Horsehead Nebula, the Perseus Cluster of galaxies, spiral galaxy IC 342, irregular galaxy NGC 6822 and globular cluster NGC 6397. IMAGE CREDIT: ESA/Euclid/Euclid Consortium/NASA ...

The Perseus galaxy cluster taken by the Subaru Telescope at the Mauna Kea Observatory in Hawaii. The newly discovered subcluster is on the right. Overlaid in blue is the inferred distribution of ...

Famed for its unbelievable size — containing the mass of some 600 trillion suns — it also has a reputation for being one of the few "relaxed" galaxy clusters out there: it shows no signs of ...