The James Webb Space Telescope (JWST) has given astronomers an unprecedented glimpse into the early universe, capturing light from just 600 million years after the Big Bang. But amid these cosmic time capsules, scientists have spotted a mystery: hundreds of tiny, crimson-colored objects now known as "Little Red Dots" (LRDs). Originally thought to be infant galaxies, these faint red blobs may instead represent something even more ancient and extraordinary: the universe’s first stars.

The JWST has identified more than 300 LRDs. Their brightness and size initially led researchers to classify them as early galaxies. Their abundance at such an early cosmic epoch has raised eyebrows. According to current models, the early universe shouldn’t have had so many massive galaxies forming so quickly. The surprising number and characteristics of these LRDs seem to challenge our understanding of how the universe evolved.

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Population III Stars: A New Possibility

A new theory, proposed by Devesh Nandal from the University of Virginia and Abraham Loeb of Harvard, suggests that these LRDs could be Population III supermassive stars, hypothetical stars from the universe’s first generation. These stars, composed only of hydrogen and helium, could have been up to a million times more massive than the Sun but would have burned out quickly, lasting only a few thousand years before dying in powerful supernovae. Such explosions could have seeded the cosmos with the first heavy elements and possibly sparked the formation of early supermassive black holes now found at the centres of galaxies.

But there's another compelling hypothesis. Harvard astronomers Fabio Pacucci and Avi Loeb have proposed that these LRDs are compact, faint galaxies born in the lowest-spinning dark matter halos. Unlike fast-spinning halos, where centrifugal forces prevent matter from collapsing tightly, slow-spinning halos allow gas to fall inward, forming dense, small galaxies, the LRDs. These objects, they say, are the cosmic relics of a quieter corner of the early universe, where galaxy formation happened under different dynamics.

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Testing The Cosmic Puzzle

To test these theories, astronomers need deeper observations. Longer exposures by JWST may reveal even fainter, older LRDs. If the dots are truly from slowly spinning halos, they should cluster together in quiet, undisturbed cosmic regions—exactly what JWST is starting to show.