Cosmic time machine: Scientists spot 'primitive star' offering peek into universe's dawn

A truly primitive star has been spotted by scientists. This incredible discovery offers a rare peek into the very dawn of our universe. Found lurking on the edge of the Milky Way, it's the most metal-poor, chemically basic star ever discovered. It gives us our closest look yet at how everything began.

A cosmic time capsule

This celestial relic, named SDSS J0715-7334, is mainly made of hydrogen and helium. It contains less than 0.005% of the metals found in our own sun. This makes its chemical makeup nearly identical to the universe's first stars.

These 'Population III' stars formed right after the Big Bang. They are impossible to observe directly today. Kevin Schlaufman, an associate professor of physics and astronomy at Johns Hopkins University, explains: "No Population III stars have ever been observed, either because they were massive, lived fast and died young, or the lowest-mass Population III stars that could persist to the present day are extremely rare."

He added: "The properties of this first stellar generation are some of the most important unknowns in modern astrophysics."

Unlocking ancient secrets

SDSS J0715-7334 formed from a gas cloud. This cloud had recently interacted with material from a Population III star's supernova. By analysing the elements in SDSS J0715-7334, astronomers can work backwards. They can figure out the mass and energy of that original Population III explosion.

Alexander Ji, an assistant professor of astronomy and astrophysics at University of Chicago, highlighted the discovery's importance: "These pristine stars are windows into the dawn of stars and galaxies in the universe."

The team used the Magellan Clay Telescope and its advanced spectrograph. They confirmed the star is almost entirely hydrogen and helium, with only tiny traces of carbon and iron. This composition suggests the Population III star that created its elements was unusually massive. It also exploded with "uncommon vigor", according to the researchers.

Professor Schlaufman added: "We've only scratched the surface with this current phase of the Sloan Digital Sky Survey."

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OFFICIAL SOURCE VERIFICATION: This report is based on official data from University Newsroom. Document: Primitive star offers rare window into the dawn of our universe Source Link: https://hub.jhu.edu/2026/04/15/astronomy-most-primitive-star/