Rocky Planets May Have Started Forming Just 100 Million Years After the Big Bang

New simulations suggest the building blocks of rocky planets may have begun forming just 100 million years after the Big Bang — long before the first galaxies emerged. Enormous early supernovae scattered the heavy elements needed for planet formation around low-mass stars, potentially opening an earlier window for habitable worlds than previously thought.

Key Takeaways

New simulations suggest the building blocks of rocky planets may have begun forming just 100 million years after the Big Bang — long before the first galaxies emerged.
Enormous early supernovae scattered the heavy elements needed for planet formation around low-mass stars, potentially opening an earlier window for habitable worlds than previously thought.

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The building blocks of rocky planets may have begun forming just 100 million years after the Big Bang — long before the first galaxies even existed, according to new astrophysical simulations.

The research, conducted by an international team and covered by multiple outlets including Phys.org, ScienceDaily, and Sci.News, suggests that enormous early supernovae scattered the heavy elements needed for planet formation around low-mass stars far earlier than astronomers had assumed.

Planet formation was long thought to require the accumulated heavy elements produced over multiple generations of star formation and death. The first stars, believed to have formed a few hundred million years after the Big Bang, were massive and short-lived, ending in spectacular supernova explosions.

The new simulations demonstrate that the debris from these early supernovae contained sufficient heavy elements — including silicon, iron, and oxygen — to begin forming rocky planet building blocks around neighboring low-mass stars. Crucially, the researchers showed that conditions around these early stars could have supported the formation of precursors to terrestrial planets with life-friendly compositions.

If confirmed, the findings dramatically expand the timeline available for life to emerge in the universe. Previous estimates suggested rocky planets didn't begin forming in earnest until roughly 1-2 billion years after the Big Bang. The new research pushes that boundary back by hundreds of millions of years.

The study adds to a growing body of evidence that the early universe was far more chemically complex than previously believed, with heavy element dispersal occurring much faster through violent stellar explosions than through the gradual enrichment models that dominated earlier thinking.

While the simulations show planet formation was theoretically possible this early, the researchers note that actual habitable worlds — with stable orbits, atmospheres, and liquid water — would have required additional conditions that may have taken longer to develop.