One of the biggest mysteries the James Webb Space Telescope has uncovered may finally have been given a promising explanation.
Astronomers believe that the strange objects known as “tiny red dots” may be huge stars — unlike anything we see in the Universe today. These giant stars may also have been the seeds that grew to become the first supermassive black holes.
The riddle that has confused scientists
The tiny red dots are tiny, bright, reddish objects that existed when the Universe was less than one billion years old. Ever since the James Webb Space Telescope first discovered them, astronomers have debated what they really are.
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Some thought it could be young galaxies. Others thought it was fast-growing black holes, powerful stellar explosions – or even a completely new type of cosmic object.
The problem is that none of these theories fully fit with what the telescope has actually observed.
The light from the small red dots contains unusual patterns of hydrogen that do not match current models of young galaxies or active black holes. At the same time, most of these objects do not produce the strong X-rays or radio waves that scientists normally expect from black holes that devour surrounding material.
This has forced scientists to look for another explanation.
Giant stars – 100,000 times more massive than the Sun
The new study, led by researchers at Harvard College Observatory, points to supermassive stars — incredible objects that may have been around 100,000 times more massive than our own Sun.
Previous research by the same team already showed that stars of this size could naturally produce the unusual hydrogen signatures seen in the tiny red dots.
In their latest work, the researchers investigated another mystery: why these objects appear so small and compact in the James Webb images.
Using computer models, they followed the lives of these giant stars —from birth to death. And they made a surprising discovery:
Unlike normal stars, supermassive stars do not steadily lose material as they age. Instead, they experience rare but violent pulsations – so-called “strange-mode” pulsations – that suddenly eject huge shells of gas into space.
A dense cocoon of gas
These expanding gas shells form a dense cocoon around the star. The cocoon captures and reshapes starlight, making the object appear compact — and creating many of the unusual features observed by James Webb.
The models also revealed that the gas emitted during these eruptions is rich in hydrogen, helium and nitrogen. Interestingly, astronomers are now beginning to detect nitrogen-rich light from some of the tiny red dots — another piece of evidence to support the giant star theory.
The birth of the first black holes
After these powerful outbursts have subsided, the supermassive star is eventually expected to collapse under its own gravity. Instead of exploding like a normal supernova, it will form the seed of a supermassive black hole.
If this theory is correct, the mysterious little red dots could represent a brief but crucial phase in cosmic history — when huge stars became the first giant black holes.
The way forward
The research team now plans to make more detailed predictions about what these stars should look like, so that future observations from the James Webb Space Telescope can test whether this intriguing explanation is correct.
Perhaps we have finally begun to understand one of the universe’s greatest mysteries – and the answer lies in some extraordinary stars.
