The animation begins 180 million years after the Big Bang and follows two billion years of change in the region that would eventually form the Milky Way. Presented by researchers at the University of Chicago, it’s a detailed simulation, not a recording or a journey through the galaxy’s entire history.
The video traces the early development of our galaxy, whose origins date back roughly 13 billion years. Its bright flashes and tangled structures represent the materials and processes involved in that formation.
Purple filaments depict hot gas, the material from which stars form. White flashes represent ultraviolet radiation emitted by stars, while yellow tones mark glowing oxygen atoms. This color scheme helps viewers distinguish what’s happening within the animated region.
Dense concentrations of light and explosion-like activity illustrate a repeating cycle. As gas cools, it condenses into stars. Energy released by those stars then heats the surrounding material, restarting the chain of development rather than letting the gas cool and collect undisturbed.
The largest, most dramatic bursts of light have a specific explanation. According to research leader Harley Katz, they correspond to catastrophic star-formation events, typically triggered by instabilities within the system or by galaxy mergers. These outsized flashes mark episodes when the process becomes especially violent.
