James Webb Finds Billion-Year Black Holes That Rival Host Galaxies' Stars

3 articles · Updated · spacedaily.com · Aug 1

Within the universe’s first 1 billion years, James Webb has spotted many compact “little red dots” that appear to host actively feeding supermassive black holes already unusually large for their age.
In the most extreme cases, those black holes rival or exceed the combined mass of all stars in their host galaxies, flipping the ratio typically seen in the nearby universe.
That pattern challenges the standard coevolution picture, which linked black hole growth to galaxy growth through the well-known mass correlation seen in mature galaxies.
Astronomers still debate what the little red dots are: some studies argue they are young supermassive black holes shrouded in ionised gas, while heavy initial seeds and rapid feeding remain competing explanations.
The finding does not weaken direct evidence for black holes from the 2019 and 2022 event-horizon images or Milky Way star orbits, but it reopens how the earliest giants formed.