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UHZ1 is a galaxy in the background that contains a special type of object called a quasar. This galaxy is very far away, at a distance of 13.2 billion light-years, and is seen as it was when the universe was only about 3 percent of its current age. The redshift measurement of approximately 10.1 indicates how much the light from this galaxy has been stretched due to the expansion of the universe.

It is currently the most distant and earliest known quasar that we have discovered as of 2023. To study UHZ1, astronomers used the Chandra X-ray Observatory and a gravitational lens provided by the mass of the Abell 2744 cluster to magnify the light coming from objects behind it, including UHZ1.

The discovery of UHZ1 has led scientists to suggest that the first quasars may have originated from direct-collapse black holes, formed by the collapse of extremely massive primordial stars at the very beginning of the universe. This finding sheds light on the early stages of galaxy and black hole formation in the universe.