The James Webb Space Telescope has been pointing to the most remote regions of the universe for years and, with each new observation, it has revealed something that doesn’t quite fit. In his images, small, tiny, bright red dots appear, which repeat with a frequency that is difficult to ignore. They are not a specific anomaly or an observation failure: they are objects that astronomers have been studying for some time without having yet achieved a convincing explanation of their nature.
The novelty. A study recently published in The Astrophysical Journal, led by Devesh Nandal and Avi Loeb, from the Harvard-Smithsonian Center for Astrophysics, opens an alternative to the most widespread interpretation. Specifically, it suggests that some of these red dots might not be systems dominated by active black holes, but rather supermassive stars formed in the early universe. Speaking to Live Science, Nandal maintains that this type of star can explain key features of these objects without depending on the presence of growing black holes.
Before this turn, the so-called “little red dots” had already been on astronomy’s radar for some time. The term began to be consolidated in studies published in 2024, when several teams began to analyze them systematically after the first Webb observations. We are not talking about a recent discovery, but rather an accumulated enigma: in WorldOfSoftware we have already addressed it as a phenomenon that is difficult to fit into current models, with very compact, extremely luminous objects present in the early universe.
The dominant hypothesis. During the first years of analysis, the explanation that gained the most traction was that these red dots were driven by growing black holes. In the first phase, some of the researchers attributed its red color to dust in the environment, although later work has shifted part of that focus to hydrogen gas.
What is starting to not fit. With the passage of time, some observations have complicated this initial interpretation. Several of these objects do not show clear X-ray emissions, one of the most common signs of active black holes, and their spectra lack strong metallic lines beyond hydrogen and helium. Added to this is “The Cliff”, one of the objects analyzed by the RUBIES program, which does not fit either as a conventional galaxy or as a system dominated by dust.
The proposal of the new study fits into this context, which proposes a different reading for at least part of these objects. Instead of active black holes, some small red dots could be supermassive stars formed from primordial gas, composed almost exclusively of hydrogen and helium, and observed just before collapsing. According to the model developed by the team, this scenario reproduces both its extreme brightness and specific features of its spectra, without having to assume the presence of a growing black hole.
The new study does not close the debate, rather it expands it. The researchers themselves acknowledge that directly demonstrating what lies behind these objects remains extremely difficult, and other voices in the scientific community insist that none of the hypotheses can yet be ruled out. The presence of black holes in these systems remains to be demonstrated directly and, for now, is inferred mainly from their brightness and how abundant they are.
Images | NASA/ESA/CSA (1, 2)
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