The James Webb Space Telescope has produced what NASA scientists are calling the strongest evidence yet for the existence of black hole stars, a theoretical class of objects proposed to explain a category of extremely bright early-universe objects that has puzzled astronomers since Webb first detected them.

The objects, known informally as little red dots, appear in Webb’s deep-field images as compact, intensely luminous sources from the very early universe, within the first billion years after the Big Bang. Their brightness and compactness were difficult to explain with standard models of early galaxy formation or even conventional supermassive black holes.

The black hole star hypothesis proposes that in the extreme conditions of the early universe, massive stars could form with black holes at their cores, sustained by the radiation pressure of the black hole against gravitational collapse. These objects would be immensely luminous and would eventually collapse entirely, seeding later galaxies with massive black holes.

NASA’s Science Mission Directorate published the findings Thursday, noting that new spectroscopic analysis of multiple little red dots has revealed signatures consistent with the theoretical black hole star profile in a way that previous hypotheses could not fully account for. The spectral data showed both the high luminosity expected from accreting black holes and stellar absorption features that suggest a surrounding stellar envelope.

The researchers cautioned that the evidence, while the strongest yet, remains indirect and that alternative explanations have not been fully ruled out. Confirmation would require direct observation of the internal structure of these objects, which current telescopes cannot achieve at the distances involved.

If confirmed, black hole stars would resolve a longstanding tension in cosmology. Models of galaxy formation have struggled to explain how the supermassive black holes found at the centres of most large galaxies, including the Milky Way, could have grown so large so quickly after the Big Bang. Black hole stars would provide a natural seeding mechanism.

The James Webb Space Telescope, operated by NASA in partnership with ESA and the Canadian Space Agency, has been producing results since 2022 that repeatedly challenge or refine previous models of the early universe. The little red dots were among its most puzzling early observations.

NASA’s full briefing on the discovery is available at the NASA Science Mission Directorate website. The convergence of astrophysics imaging and consumer camera sensor technology is discussed in analysis of the Sony A7R VI, whose imaging sensors share foundational technology with Webb’s near-infrared detectors. Space observation data management intersects with modern computing platforms covered in the Apple Silicon architecture and Google Tensor chip developments.