Lumina Simulation Recreates Universe's First Two Billion Years
Researchers used the Lumina model on the Frontier supercomputer to simulate the early history of the cosmos in unprecedented detail.
Updated on Nov. 8, 2026 in Physics
A new simulation called Lumina has recreated the first two billion years of universe history. The model covers a region of space about 1.6 billion light-years across and was run on Frontier, one of the world's most powerful supercomputers.
Why it matters
The simulation captures how hydrogen and helium were reionized by radiation from the first stars, galaxies and supermassive black holes. Comparing it with telescope observations could help scientists understand how the first galaxies formed.
Lumina's volume is about 100 times larger than previous leading simulations and its resolution is about 30 times higher than IllustrisTNG, using roughly half a trillion computational elements. Whether its outputs will align with observed early-universe data has not yet been tested in the available extraction.
The players
Massachusetts Institute of Technology
A private research university in Cambridge, Massachusetts, known for its strong programs in physics, astronomy and computational science.
Harvard University
A private research university in Cambridge, Massachusetts, one of the oldest and most prominent academic institutions in the United States.
The details
Lumina combines the evolution of dark matter, gas, stars and radiation, building on the IllustrisTNG model. It captured the reionization of both hydrogen, driven mainly by ultraviolet light from early stars and galaxies, and helium, linked to intense radiation from supermassive black holes. The study was published in Monthly Notices of the Royal Astronomical Society.
Timeline
About 380,000 years after the Big Bang, the universe entered a dark era without bright structures.
The simulation covers the first two billion years of cosmic history.
The Big Picture
Lumina builds directly on the IllustrisTNG model, extending it to a volume about 100 times larger and a resolution about 30 times higher. The larger scale lets researchers follow the reionization of both hydrogen and helium within a single simulated region of space.
Simulations like Lumina could help astronomers interpret telescope data, sharpening theories about how the first stars and galaxies formed. The tools developed for such work may also inform future computational research across scientific fields.
The takeaway
Large-scale simulations are becoming a key way to test ideas about the universe's earliest epochs when direct observation is limited. Lumina shows how combining detailed physics with massive computing can narrow the gap between theory and telescope data.
Further reading
Explore more in Physics to see how simulations like this one connect to broader questions about the universe's origins.
Source note: This article includes information reported by Tovima.
