Black Hole Star: JWST Found an Object 100 Billion Times Too Bright

One hundred billion times. That is how much more energy this object puts out than any known star can physically produce, which is the number that moves it out of stellar territory and into black hole territory. A team including MIT researchers found it with JWST, and the paper landed in Nature on 12 August. They have started calling it a black hole star.

What the object looks like

It sits in the early universe, it is extremely bright, it is very red, and it is roughly the size of our solar system. Wrapped around it is a thick cloud of gas. Nothing in stellar physics accounts for that combination, because no fusion process scales to 100 billion times the output of a normal star without the star tearing itself apart first.

The proposal is straightforward once you accept the size. A supermassive black hole sits at the centre, shrouded in so much gas that the whole structure glows like an enormous star rather than like a naked accretion disc. The gas is doing the radiating. The black hole is doing the feeding.

Why this matters for the little red dots

JWST has been turning up small, red, unidentified objects in almost every deep field it looks at. FT covered them on 27 August as an open mystery with three competing explanations and no clear winner. This is one of those explanations picking up evidence.

If black hole stars are what the little red dots are, two problems close at once. The dots stop being anomalous, and astronomers get a mechanism for the harder question underneath them: how supermassive black holes reached the masses they did so soon after the Big Bang. A black hole feeding inside a dense gas envelope grows quickly, and quickly is exactly what the timeline demands.

What to watch next

One paper is not a settled result, and the gas-shrouded interpretation still has to survive follow-up spectroscopy from other teams looking at other dots. The useful test is whether the same signature turns up consistently across the population rather than in this one object. JWST has plenty of deep fields left to check.

For how the current generation of telescopes differ from each other, see our comparison of Roman and Webb. For another result sitting in the same waiting-on-confirmation state, there is the LZ dark matter signal. JWST has also been busy closer to home, finding water near the Milky Way's own black hole.

If you want to spend more time on the sky yourself, a decent pair of astronomy binoculars does more for a beginner than a cheap telescope. The Celestron Cometron 7x50 is the usual starting recommendation, and current pricing is on Amazon. It will not show you a black hole star. It will show you why people started pointing things upward in the first place.

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