Early Earth: Asteroids melted the planet's first crust

There's a black hole in Earth's history, not exactly a hole, more like amnesia. We're talking about the first 500 million years, the Hadean Eon, spanning from 4.5 to 4 billion years ago. For a long time, scientists wondered why so few rocks from that period existed. They simply couldn't find them.

The classic theory stated our newborn Earth was a scorching inferno, with a molten mantle boiling away. This would have prevented a stable crust from forming. Basically, primordial chaos. But now it seems the chaos was also- external.

Well, it wasn't a fire-breathing dragon, but close enough. New research, featured on Ars Technica in July 2026, suggests Earth's primordial crust was melted not just by internal heat, but by a hellish cosmic bombardment. Imagine country-sized asteroids continuously slamming into the planet.

These impacts weren't just making craters. They were so energetic they generated incredible heat, melting any surface rock formations. It's like trying to build a sandcastle while someone constantly throws buckets of water at you. Of course, no trace remains. The crust had no chance, being continuously melted and recycled.

This discovery isn't just a detail for geologists with shovels. It shows us our planet was born into an even more violent environment than we previously thought. The "heat" that shaped early Earth wasn't just an internal affair; it was also a matter of cosmic beatdowns.

Understanding the impact of these bombardments is crucial for reconstructing how the first landmasses formed, and who knows, maybe even the earliest life forms. Next time you look at a rock, think about the havoc asteroids wreaked billions of years ago. It makes any construction site look tame.