A recent study reveals that Luca, our oldest known ancestor, was a single-celled organism living in a complex ecosystem around 4.2 billion years ago.
The discovery of Luca suggests that life on Earth began almost as soon as conditions allowed, hinting that life may be abundant across the universe.
The Hadean geological period, named for the Greek god of the underworld, was a harsh environment but also the cradle of early life including Luca.
Luca embodies the principle of Darwinian evolution, as all organisms have descended from earlier ones, contributing to the rich diversity of life we see today.
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