Canadian Telescope Detects Ancient Hydrogen and Opens a New Window Into the Universe

A Canadian radio telescope has detected a faint signal from ancient hydrogen using only its own observations, giving scientists a new way to study how the universe has expanded over billions of years.

The breakthrough came from the Canadian Hydrogen Intensity Mapping Experiment, known as CHIME. Researchers say the technique could eventually help scientists investigate dark energy, the mysterious phenomenon believed to be linked to the accelerating expansion of the universe.

A Signal From Five Billion Years Ago

CHIME detected radio emissions from hydrogen gas that existed when the universe was about five billion years old. The signal came from a period when the cosmos was much younger than it is today.

The researchers analyzed data collected during 94 nights of observations in 2019. Because the hydrogen signal is extremely faint, the team spent more than a year testing the result to make sure it was not caused by noise from the telescope, human technology or the surrounding environment.

After repeated checks, the signal remained.

Hydrogen Acts Like a Cosmic Map

Hydrogen is the most abundant element in the universe and is also the basic material from which stars form. Its radio emission can therefore provide astronomers with a way to trace how matter is distributed across enormous distances.

By mapping this ancient hydrogen, scientists can study how galaxies and other structures were distributed in the early universe and how that distribution changed over time.

CHIME Did It Without Another Telescope

Previously, CHIME observations of ancient hydrogen had to be compared with data from other telescopes and galaxy surveys. The new result is different because the detection was made using CHIME’s own data alone.

This is important because independent measurements can help scientists test whether their understanding of the universe is correct without relying on another observing system.

Researchers say the technique could also be less expensive than traditional galaxy surveys and could allow scientists to examine much larger regions of the universe.

A New Tool for Studying Dark Energy

One of the biggest questions in modern astronomy is why the expansion of the universe is accelerating. Scientists refer to the unknown cause as dark energy, but its nature remains poorly understood.

Because the distribution of hydrogen changes as the universe expands, mapping hydrogen at different points in cosmic history could give researchers another way to investigate this mystery.

The current discovery uses only a small portion of the observations CHIME has collected. The team now plans to analyze additional data, potentially reaching even further back into the history of the universe.

Scientists Have Much More Data to Explore

CHIME has accumulated nearly seven years of observations. Researchers hope that studying this larger dataset will allow them to build increasingly detailed maps of ancient hydrogen and improve their understanding of how the universe evolved.

What began as an extremely faint radio signal has therefore become a promising new tool for exploring some of the biggest questions in astronomy.

Sources

• Live Science — “Ancient hydrogen spotted in the early universe could open a new way to study space’s baffling expansion” — September 30, 2026.
• Dunlap Institute for Astronomy & Astrophysics, University of Toronto — “Canadian telescope directly maps earliest glow of hydrogen, opening a new window on the universe” — September 28, 2026.
• University of British Columbia / EurekAlert! — “Canadian telescope directly maps earliest glow of hydrogen, opening a new window on the universe” — September 28, 2026.
• The Astrophysical Journal — “Detection of the Cosmological 21 cm Signal in Autocorrelation at z ∼ 1 with the Canadian Hydrogen Intensity Mapping Experiment” — 2026.