Astronomers have recently detected a powerful and mysterious burst of radio waves, dubbed FRB 20220610A, that traveled an astounding 8 billion years through space to reach Earth. This “fast radio burst” (FRB) is not only one of the most distant ever observed but also exceptionally energetic. Its detection offers an unprecedented glimpse into the early universe, providing a unique window into cosmic events that occurred when the cosmos was less than half its current age.
Fast radio bursts are enigmatic, millisecond-long flashes of radio waves that can release as much energy in a fraction of a second as our Sun emits over decades. While their exact origins remain a subject of intense scientific investigation, current theories often link them to highly magnetized neutron stars called magnetars, possibly born from supernovae or associated with merging galaxies, which this particular FRB’s source galaxy suggests.
The discovery of FRB 20220610A was made using the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope. Following its detection, astronomers utilized the European Southern Observatory’s Very Large Telescope (VLT) to pinpoint its origin to a compact group of multiple galaxies. These galaxies appear to be in the process of merging, an environment that could potentially trigger such powerful cosmic explosions, providing valuable clues to the FRB mystery.
One of the most significant implications of this 8-billion-year-old signal is its potential to “weigh” the universe. As FRBs travel through the vast cosmic web, their signals are dispersed by ionized matter, particularly electrons, scattered between galaxies. By measuring this dispersion, scientists can effectively gauge the amount of “missing matter” – the elusive ordinary matter that has been difficult to directly observe – distributed across the cosmos.
This record-breaking FRB confirms the Macquart relation, a tool that uses FRBs to map out hidden matter on cosmic scales, even for bursts from halfway across the universe. The ability to detect electrons in nearly empty space offers a promising new method for solving this long-standing cosmic puzzle, providing critical data to refine our understanding of the universe’s structure and evolution over billions of years.
