The Double Cluster (NGC 869 and NGC 884, also known as h and χ Persei) is a visually striking pair of star clusters visible to the naked eye, documented since at least 130 BC. Located approximately ...

How do rogue planetary-mass objects -- celestial bodies with masses between stars and planets -- form? An international team of astronomers has used advanced simulations to show that these enigmatic ...

NASA estimates the resulting mega-cluster will combine weights “several hundred trillion times” more than our Sun. The monstrous body will emerge from the collision of four galactic clusters about ...