Mars may look like a dry, dusty world today, but billions of years ago, water interacted with its rocky surface.
Now, scientists have found new evidence of that ancient water hidden inside a Martian meteorite that landed on Earth.
The meteorite, known as NWA 7034 or “Black Beauty,” contains some of the oldest known pieces of the Martian crust.
Using advanced imaging techniques, researchers discovered surprisingly large regions rich in hydrogen inside the rock.
These areas provide clues about how water interacted with Mars very early in the planet’s history.
Black Beauty weighs about 320 grams and contains material as old as 4.48 billion years. It was blasted off Mars by a powerful impact and eventually landed in the Moroccan Sahara.
Scientists already knew the meteorite contained signs of water. Previous studies measured its overall water content or examined extremely thin slices under microscopes.
However, these methods could not show how water-related minerals were distributed throughout larger sections of the rock.
In the new study, researchers from Denmark, Sweden and Switzerland combined neutron tomography with X-ray tomography to examine a 12-by-8-by-2-millimeter piece of Black Beauty in three dimensions without damaging it.
The two technologies reveal different features. X-rays are particularly useful for detecting heavier elements such as iron and silicon. Neutrons, however, are highly sensitive to hydrogen, making them ideal for finding minerals that formed through interactions with water.
X-ray images initially revealed what appeared to be holes inside the dense meteorite. But when scientists examined the same areas using neutrons, they discovered that the spaces were not empty. Instead, they contained hydrogen-rich material.
More importantly, these traces were not evenly spread throughout the meteorite. They formed distinct hotspots concentrated mainly within very ancient fragments of Martian rock. These hotspots accounted for about 11% of the total water content detected in the sample.
That distribution provides an important clue about Mars’ distant past. It suggests that water was already present when the Martian crust was very young. Water may have reacted with rocks during volcanic activity, meteorite impacts or other energetic geological events, leaving hydrogen trapped within hydrated minerals.
Black Beauty is particularly valuable because it is a breccia—a rock made from fragments of different ages that were broken apart and later fused together by violent geological events. In effect, it acts like a time capsule preserving different chapters of Martian history.
The research also demonstrates a powerful new way to study rare extraterrestrial samples. Scientists can now map hydrogen inside Martian rocks in three dimensions without cutting or destroying them.
That could become especially valuable if future missions return pristine rocks from Mars or other worlds to Earth.
By looking inside them with neutrons and X-rays, scientists may uncover evidence of ancient water—and learn more about whether distant worlds once had environments capable of supporting life.
