As it nears 35 consecutive years of space service, the NASA/ESA Hubble Space Telescope has taken another look at a famous ...

ESA’s XMM-Newton and, especially, NASA’s Chandra X-ray Observatory, both launched in 1999, can produce much higher-resolution images of the intra-cluster plasma. However, this comes at the ...

Astronomers have long been puzzled by mysterious, planet-sized objects drifting freely through space, unattached to any star. These cosmic wanderers, called planetary-mass objects (PMOs), weigh less ...

"The Phoenix cluster has the largest reservoir of hot, cooling gas of any galaxy cluster." How do you cool down a phoenix? I don't mean the mythological birds of flame and rebirth, but rather a ...

The stars were likely ejected due to gravitational interactions within the dense cluster. Crowded newborn stars may disrupt each other’s orbits, resulting in some being flung out of the cluster.