Astronomer use simulations on powerful computers to study the universe's formation and evolution, including the elusive first star that existed ealier than any current celestial objects we observe. By calculating the effects of cosmic expansion, gravity, and various physical processes, these simulations provide insight into where the first stars may have formed and what they might look like today. Researchers can gain a deeper understanding of the early stages of the universe and how stars and galaxies came into being through this computational approach.