Scientists have identified a "sweet spot" in Earth's deep past when conditions were optimal for the RNA World, a proposed early stage of life that may have preceded LUCA, the last universal common ancestor of all living things. According to the research, this window occurred around 4.33 billion years ago, when the planet was still in its infancy.
The RNA World hypothesis suggests that before DNA and proteins, life relied on RNA molecules capable of both storing genetic information and catalyzing chemical reactions. The new study indicates that the environmental conditions necessary for such a system to emerge were present at that specific time.
While the exact timing of life's origins remains debated, this finding adds to the growing body of evidence that life may have arisen relatively soon after Earth formed, roughly 4.5 billion years ago. The research highlights the narrow window during which the planet's climate and chemistry aligned to allow the first self-replicating molecules to take hold.
Further studies will be needed to confirm the details of this early phase and its connection to LUCA, but the work offers a new perspective on how life might have begun on our planet.
