MEGATRON simulations reveal how the first stars shaped the universe

The MEGATRON international research project, led by the University of Bath in collaboration with institutions in the United States and France, has released four studies in the Open Journal of Astrophysics detailing how the universe’s first stars and galaxies formed. Using sophisticated computational simulations, the project examines the transition from a dark universe filled with hydrogen and helium to one illuminated by stellar activity.

The simulations track the evolution of young galaxies, modeling how radiation, gas movement, and chemical synthesis interact over billions of years. This research provides a physical bridge between two types of astronomical evidence: direct observations of infant galaxies via the James Webb Space Telescope and the chemical signatures found in ancient stars within the Milky Way.

By recreating conditions shortly after the Big Bang, the models show how the first generation of stars produced and dispersed heavy elements like carbon, oxygen, and iron through radiation and supernova explosions. These elements provided the essential building blocks for subsequent generations of stars, planets, and life.