eons ago

One theory holds that, eons ago, several apocalyptic eruptions set off a runaway greenhouse effect on Venus, turning it from a temperate, waterlogged world into an arid desert of burned glass.

Astronomers suspect an unusual near-Earth rocky object is not a typical escapee from the Solar System’s asteroid belt, but is instead a chunk of the Moon blasted into space eons ago by a spectacular impact.

In a bit of biological magic, some tiny, jellyfish-like creatures learned eons ago how to weave seawater into durable, life-sustaining, rocky coral reefs, which provide billions in economic benefits.

She was my catechism teacher, and she paced our classroom floor while lecturing that, eons ago, all humans had belonged to the same tribe.

She was my catechism teacher, and she paced our classroom floor while lecturing that, eons ago, all humans had belonged to the same tribe.