Plate Nº 71 · recorded October 10, 2026
Space & AstronomyReported finding
Milky Way Among Best Places for Life, Supercomputer Simulation Finds
A supercomputer simulation of cosmic history finds the Milky Way ranks among the calmest, most life-friendly galaxies. Fewer than 1 in 1,000 stars here face catastrophe per billion years, while smaller galaxies stay too crowded and energetic.
By Elena Vasquez3 min read597 words
In brief
- Fewer than 1 in 1,000 stars in today's Milky Way would suffer a life-annihilating event per billion years, the simulation finds
- The simulation spans hundreds of millions of light-years and uses the EAGLE galaxy-evolution model
- Smaller galaxies are too crowded and too energetic to host the best habitable conditions
- The Ordovician mass extinction 450 million years ago may have been triggered by a nearby gamma-ray burst
- The study was published in Monthly Notices of the Royal Astronomical Society (2026), DOI 10.1093/mnras/stag1750
A new supercomputer simulation of cosmic evolution finds that fewer than one star in a thousand in the present-day Milky Way would face a life-annihilating catastrophe over the next billion years. The result, reported in Monthly Notices of the Royal Astronomical Society, places our galaxy among the calmest, most life-friendly neighborhoods in the universe.
How did researchers hunt for cosmic real estate?
The team, led by Luke A. Barnes of Western Sydney University, used the EAGLE project—short for Evolution and Assembly of GaLaxies and their Environments. The simulation models gravity, gas physics, star formation, and supermassive black holes across hundreds of millions of light-years of cosmic volume. It reproduces what astronomers see through telescopes, giving the researchers a working map of where conditions could support rocky, Earth-like worlds.
What makes a galaxy friendly to life?
Barnes and his colleagues focused on the "galactic habitable zone"—the galaxy-scale cousin of the habitable zone around individual stars. Several hazards shrink the friendly real estate:
- Nearby supernovae. Massive stars explode and sterilize their neighborhoods. Gamma-ray bursts can reach farther still. Some paleontologists link the Ordovician mass extinction 450 million years ago to such a blast.
- Hot Jupiters. Planets need heavy elements to form, but excess metal-rich material can spawn gas giants that plow through inner systems, devouring rocky worlds.
- Stellar traffic jams. A star straying too close can tug a planet out of a stable, circular orbit.
- Supermassive black holes. The monsters at galactic centers, weighing more than a million suns, can flare when they feed and strip atmospheres off nearby planets.
Where does the Milky Way fit in?
The simulation ranks the Milky Way as unusually quiet. "We discovered something reassuring: the sun, sitting here in the outskirts of the Milky Way galaxy, is about as good as it gets," Barnes and his coauthors write. Across a billion years of galactic wandering today, fewer than one star in a thousand would suffer a life-annihilating catastrophe.
That calm did not last forever. The Milky Way and similar galaxies have left their rowdy youth behind, when mergers and explosions happened often. Their "energetic and dangerous days" are largely over, the team argues, leaving a stable window for life to emerge and persist.
What about the rest of the universe?
Small galaxies tell a different story. They outnumber Milky Way-type systems by a wide margin, but the simulation shows they pack in too much activity—more supernovae, more gravitational disruption. Cosmic catastrophes there catch up with new planet formation faster than life-friendly conditions appear.
The team also flags a broader trend. Earlier in cosmic history, galaxies forged heavy elements faster than they destroyed worlds. Now that balance is tipping. The universe appears to be slowing down, the researchers report, as new stars form more slowly and existing systems settle. Habitable windows still exist, but they do not open as quickly as before.
What don't we know yet?
The researchers stress several limits. They assume heavy-element concentrations, planet-formation rates, and survival thresholds for nearby explosions—none measured directly for most galaxies. They also cannot say whether life actually forms in these friendly zones, only that conditions look favorable.
EAGLE covers vast volumes at the cost of resolution. Each simulated galaxy is a rough sketch, not a planet-by-planet portrait. Future work will need finer models to test whether specific Milky Way–like systems really do shelter living worlds.
The full study appears in Monthly Notices of the Royal Astronomical Society (2026) under DOI 10.1093/mnras/stag1750.
via Phys.org Space & Astronomy (Source)
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