A Universe You Can See and Hear
Imagine exploring the cosmos not just through images, but through sound. A new generation of cosmological simulations is turning that idea into reality, offering a richer, more immersive way to understand how galaxies are born and evolve.
At the heart of this breakthrough is COLIBRE, a powerful suite of simulations developed by an international team of astronomers. Led in part by Dr James Trayford at the University of Portsmouth and Leiden University, the project recreates the evolution of galaxies from the early universe to the present day with unprecedented realism.
What sets COLIBRE apart is not just its visual accuracy, but its ability to “translate” cosmic processes into sound. Using innovative sonification techniques, scientists have created videos where changes inside galaxies—like bursts of star formation or the growth of black holes—can actually be heard. This adds a new sensory dimension to astronomy, helping both researchers and the public better grasp the complex physics at play.
The science behind the simulations is just as impressive. Earlier models struggled to include key ingredients such as cold gas and cosmic dust—the raw materials for star formation. COLIBRE overcomes this by modelling these components directly, allowing galaxies in the simulation to behave much more like those observed by telescopes such as the James Webb Space Telescope.
This matters because cold gas and dust play a crucial role in shaping galaxies. Dust grains help form hydrogen molecules, shield gas from radiation, and even affect how galaxies appear by absorbing and re-emitting light. By including these effects, COLIBRE bridges the gap between theory and observation more effectively than ever before.
The results are encouraging: when these missing pieces are added, the standard model of cosmology does a remarkably good job of explaining how galaxies grow over billions of years. Even some puzzling observations from the early universe now fit more comfortably within existing theories.
Still, mysteries remain. Strange objects known as “Little Red Dots,” possibly linked to the birth of supermassive black holes, are not yet reproduced by the simulations. Their absence hints that there is still more physics to uncover—and more computing power to harness.
For now, COLIBRE stands as a new kind of cosmic laboratory: one where scientists can not only see the universe unfold, but also listen to its hidden rhythms. It’s a reminder that even in the silent vacuum of space, there may be more to “hear” than we ever imagined.
Link to the article accepted in Monthly Notices of the Royal Astronomical Society: https://arxiv.org/abs/2508.21126
