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Scientists detect signals of hydrogen from billions of years ago. Could this help us map out the universe?
space.com Sep 4, 2026

Scientists detect signals of hydrogen from billions of years ago. Could this help us map out the universe?

Curated by · TechCapsules ·

AI-summarised brief · reviewed before publication

Astronomers using South Africa’s MeerKAT radio telescope have successfully detected faint hydrogen signals from 4 to 5 billion years ago, marking a significant milestone in cosmology. This achievement validates hydrogen intensity mapping as a practical tool for charting the universe’s large-scale structure without relying on visible-light galactic surveys. By analyzing 96 hours of data, the team isolated the 21-centimeter line emissions from neutral hydrogen, which is redshifted due to cosmic expansion. This method allows researchers to measure collective hydrogen signals across vast cosmic volumes, offering insights into galaxy evolution and matter distribution. The study, led by Sourabh Paul, demonstrates that faint signals can be extracted from existing data despite interference. This success paves the way for future observations with the Square Kilometre Array Observatory, promising more detailed 3D maps of the cosmos and enhancing our understanding of how universal structures formed over billions of years.

💡 Why It Matters

  • · This breakthrough proves that radio-only mapping can efficiently trace cosmic history, bypassing the limitations of traditional optical surveys.
  • · It establishes a scalable method for the upcoming Square Kilometre Array to decode the universe's structural evolution.
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