Moon's Hidden Past Revealed 4 Billion Years Later

Scientists just mapped 4 billion years of lunar history hiding beneath the moon's surface, and the story it tells is breathtaking.

China's Chang'e-4 lander made history in 2018 as the first spacecraft to touch down on the far side of the moon. Since then, it's been doing something no other mission could: scanning deep below the lunar surface to reveal what's been hidden for eons.

The results, published in the Journal of Geophysical Research: Planets, show the top 130 feet of moon rock holds incredible secrets. Researchers found multiple layers of dust, soil, and broken rocks, including an ancient crater left by a massive space collision.

But the real treasure lies deeper. Scientists discovered five distinct layers of volcanic lava that flowed across the moon's surface billions of years ago, painting a picture of an active, almost Earth-like world.

Jianqing Feng, an astrogeological researcher at the Planetary Science Institute in Arizona, led the groundbreaking analysis. His team noticed something fascinating: the volcanic layers got thinner the closer they were to the surface.

This tells a story of a moon slowly cooling down over time. "The moon was slowly cooling down and running out of steam in its later volcanic stage," Feng explained. "Its energy became weak over time."

Our moon formed 4.51 billion years ago when a Mars-sized object crashed into Earth and broke off a chunk of our planet. For the next 200 million years, space debris pummeled the moon's surface, creating cracks that filled with molten magma from volcanic eruptions.

Why This Inspires

This mission shows how far human curiosity and collaboration can reach. The Chang'e-4 is still exploring, still sending back data that rewrites what we thought we knew about our closest cosmic neighbor.

The findings also suggest that pockets of magma might still exist deep beneath the lunar surface. While volcanic activity likely ended between 1 billion and 100 million years ago, the moon continues to surprise us with its complexity.

Feng and his team hope this is just the beginning of truly understanding the moon's geological story, one layer at a time.