09/28/2026
Canadian telescope directly maps earliest glow of hydrogen, opening a new window on the universe
The CHIME telescope has made its first standalone detection of the glow of hydrogen from when the universe was about five billion years old, paving the way for new studies of cosmic expansion and dark energy.
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has shown, for the first time, that it can detect the faint glow of hydrogen gas from deep in the universe's past using only its own data.
The breakthrough paves the way for a faster, less expensive method for scientists to study dark energy — the mysterious force thought to be driving the universe to expand at an ever-increasing rate, and one of the biggest open questions in physics. The achievement also marks a milestone for the telescope, built for this very reason. The findings are published in a paper today in "The Astrophysical Journal."
“Hydrogen is the most common element in the universe and the raw material from which stars form,” said co-author Dr. Arnab Chakraborty, postdoctoral fellow at the University of Toronto who first proposed the finding. “Its faint radio emission acts like a cosmic tracer, revealing how matter is distributed across space.”
There are contradicting theories about the nature of dark energy in the astrophysical community. Using its own data, CHIME can investigate these theories independently and help prove or disprove them.
“This is a completely new technique for probing the cosmos, delivered by an instrument that was conceived, built and funded by Canadians,” said co-author Dr. Mark Halpern, professor in UBC Department of Physics & Astronomy and CHIME principal investigator. “It’s a bold new step in the global cosmology program and a Canadian success story.”
Read more: https://science.ubc.ca/news/2026-09/canadian-telescope-directly-maps-earliest-glow-hydrogen-opening-new-window-universe