Brief

Megatron simulations map first stars’ impact on early universe

The Megatron project uses detailed modelling to show how the earliest stars altered gas, radiation and chemistry in the infant universe.

By Felo News Desk · Published Tue, 06 Oct 2026 20:42:19 GMT

Researchers have unveiled the Megatron supercomputer simulations, which combine observations from the James Webb Space Telescope (JWST) with chemical fingerprints preserved in ancient Milky Way stars to reconstruct how the first stars reshaped the early universe, scitechdaily.com reported.

The simulations start with pristine hydrogen‑helium gas, follow the birth of massive first‑generation stars, track the intense starlight they emit, model their supernova explosions and map the spread of newly forged elements such as carbon, oxygen and iron into later‑generation galaxies. By linking these processes with JWST’s direct view of young galaxies, Megatron provides a “physical bridge” between distant observations and local stellar archaeology.

Dr Martin Rey of the University of Bath explained that JWST offers a direct glimpse of the infant cosmos, while the chemical signatures in nearby ancient stars let astronomers study the relics of those early times. He said, “MEGATRON provides a physical bridge between the two.” He added that understanding the first stars is essential because “the elements that make our world and life possible – carbon, oxygen, iron and many others – were forged by stars.”

The project suggests that simpler models may underestimate how strongly stellar radiation and chemistry reshape surrounding gas, emphasizing the need for high‑resolution, self‑consistent simulations to capture the interplay of light, gas and enrichment in the first galaxies.

Key facts

The Megatron simulations link JWST galaxy observations with chemical signatures in ancient Milky Way stars. (scitechdaily.com)
First stars produced heavy elements such as carbon, oxygen and iron that later seeded new stars and planets. (scitechdaily.com)
Dr Martin Rey of the University of Bath highlighted Megatron’s role in bridging JWST data and stellar archaeology. (scitechdaily.com)