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American Focus > Blog > Tech and Science > Fast Radio Bursts Reveal Where The Universe’s Missing Matter Is Hiding : ScienceAlert
Tech and Science

Fast Radio Bursts Reveal Where The Universe’s Missing Matter Is Hiding : ScienceAlert

Last updated: June 21, 2025 3:40 pm
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Fast Radio Bursts Reveal Where The Universe’s Missing Matter Is Hiding : ScienceAlert
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Astrophysicists have made a groundbreaking discovery by tracing powerful radio signals back to their host galaxies near the beginning of time, revealing where the Universe’s missing matter is hiding. This revelation sheds light on a longstanding mystery that has puzzled scientists for decades.

In the vast space between galaxies, where matter drifts in quantities too tenuous to be seen with the naked eye, fast radio bursts (FRBs) provide a glimpse into the hidden realm of the cosmos. These FRBs carry the energy equivalent of 500 million Suns and serve as beacons guiding astronomers to the elusive missing baryonic matter.

“The decades-old ‘missing baryon problem’ was never about whether the matter existed,” explains astrophysicist Liam Connor of the Harvard-Smithsonian Center for Astrophysics. “It was always: Where is it? Now, thanks to FRBs, we know: three-quarters of it is floating between galaxies in the cosmic web.”

Normal matter, composed of baryonic particles, makes up just 5 percent of the Universe’s matter-energy composition. This matter includes everything we can directly observe, from stars and galaxies to planets and black holes. However, discrepancies arose when comparing the expected amount of baryonic matter with the visible matter in the sky, leading to the realization that half of the Universe’s normal matter was unaccounted for.

Recent observations have revealed hints of this missing matter in the vast expanse between galaxies, known as the intergalactic medium. While this matter is too faint to be detected by traditional instruments, the presence of enough material to distort the signals of FRBs has provided a clue to its whereabouts.

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FRBs, rapid bursts of radio waves with immense power and short duration, have emerged as key players in this cosmic puzzle. By studying 60 FRBs and analyzing the signals for signs of interaction with baryonic matter, researchers have been able to weigh the intergalactic medium and unravel the mystery of the missing baryonic matter.

According to the findings, the majority of the Universe’s normal matter resides in the intergalactic medium, predominantly as hydrogen gas. Dark matter haloes surrounding galaxies and galaxy clusters account for 15 percent of the matter, while the remaining fraction comprises the stars and interstellar medium within galaxies.

This discovery marks a significant milestone in astronomy, providing new insights into the composition and structure of the Universe. As astronomers continue to explore the cosmos in search of baryonic matter, further revelations about the evolution of the Universe over its 13.8 billion-year history are expected to emerge.

“It’s a triumph of modern astronomy,” remarks astronomer Vikram Ravi of Caltech. “We’re beginning to see the Universe’s structure and composition in a whole new light, thanks to FRBs. These brief flashes allow us to trace the otherwise invisible matter that fills the vast spaces between galaxies.”

The research detailing this groundbreaking discovery has been published in Nature Astronomy, showcasing the remarkable progress made in unraveling the mysteries of the cosmos.

TAGGED:BurstsFasthidingMatterMissingradiorevealScienceAlertUniverses
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