The surprisingly bright galaxy, called HD1, may contain some of the universe’s first stars as well as a supermassive black hole
Researchers have spotted what might be the farthest astronomical object ever found — a galaxy candidate named HD1 that they estimate is 13.5 billion light-years away. That's an astonishing 100 million light-years more distant than the current farthest galaxy, GN-z11.
Now researchers suggest two new possibilities to explain the extreme energy emitted from the galaxy. On the one hand, it might have a supermassive black hole 100 million times as massive as the sun at its center; that would be the oldest black hole that size ever observed. On the other hand, HD1 might be home to some of the universe's very first stars, which astronomers haven't been able to observe to date.
These stars, called Population III stars, are believed to produce much higher levels of ultraviolet light than typical stars, potentially explaining HD1's brightness. Astronomers spotted HD1 during 1,200 hours of observation with the Subaru Telescope in Hawaii, VISTA Telescope in Chile, the U.K. Infrared Telescope, and NASA's now-retired Spitzer Space Telescope, then confirmed its distance with observations gathered by the Atacama Large Millimeter/submillimeter Array in Chile. The team will soon observe HD1 with the James Webb Space Telescope to further verify their calculations, they said.
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