Last Updated on May 20, 2026 by Staff
Scientists from South Korea found something cool. They think that asteroid impact craters might have helped life on Earth. Researchers from the Korea Institute of Geoscience and Mineral Resources discovered stromatolites inside the Hapcheon impact crater. This crater is the one on the Korean Peninsula that we know was made by an asteroid.
The Korea Institute of Geoscience and Mineral Resources researchers published their findings in a magazine called Communications Earth & Environment. This could help us understand how the Earth’s air got much oxygen a long time ago.
Stromatolites are like rocks that ancient tiny living things made. These tiny living things, like cyanobacteria make oxygen when they do photosynthesis. We know that stromatolites are some of the signs of life on Earth and they are over 3.5 billion years old.
The stromatolites that the researchers found were 10 to 20 centimeters across. They were in the part of the Hapcheon crater. This is the time that scientists have found these biological structures at this site.
The researchers think that the crater used to be a lake after a big asteroid hit the Earth. This lake would have been a place for early oxygen-making microbes to live.
Lakes After Impact
When a big asteroid hits the Earth it makes a lot of heat and pressure. The rocks. The area around the crater changes a lot. Sometimes the crater fills with water to make a lake.
The researchers think that the Hapcheon crater was a lake after the asteroid hit. The heat from the melted rocks probably kept the water warm and full of minerals for a time.
This kind of environment is great for living things because it is warm and has a lot of nutrients. The scientists think that these lakes might have been places for early microbes to grow.
The stromatolites that the researchers found seem to support this idea. They did some tests. Found signs of hot water and things that are linked to the asteroid impact.
The researchers found that the inside layers of the stromatolites had signs of hot water. This means that they probably formed when the lake was still very hot. As the lake cooled down the microbes kept growing and making structures.
This discovery helps us think that asteroid impacts might not just have been bad for the Earth but also might have made places that helped life grow.
Oxygen Revolution
This finding might also help us understand an event in the Earth’s history: the Great Oxidation Event.
A time ago about 2.4 billion years ago the air on Earth started to have a lot more oxygen. Before this the air did not have oxygen and the Earth was very different.
The scientists think that cyanobacteria living in stromatolites made a lot of this oxygen through photosynthesis. They have been wondering where these early oxygen-making microbes lived.
The new study suggests that hydrothermal lakes in asteroid craters might have been like oxygen oases. These small lakes could have supported a lot of microbes that slowly released oxygen into the air.
If this is true asteroid impacts might have helped make the Earth a place that can support life.
The researchers say that these crater lakes would have been places even when the rest of the Earth was harsh and unstable.
Clues Beyond Earth
This discovery is important not for our planet but also for others. The scientists think that similar hydrothermal lakes might have existed on Mars a time ago.
Mars used to have water, rivers and lakes on its surface. Asteroid impacts made a lot of craters on Mars.
Because of this the researchers think that Martian craters might be places to look for signs of old microbial life.
If hydrothermal lakes formed in craters like they did on Earth they might have made environments that were good for microbes.
The discovery of stromatolites in the Hapcheon crater gives us clues for space missions that are looking for signs of old life on Mars.
The scientists say that understanding how life started and evolved on Earth can help us look for life in the universe.
A New Perspective
This study changes how we think about asteroid impacts. Usually we think of them as events that can cause extinctions and damage the environment.
The new findings suggest that impacts might also have made places that helped life grow by making warm nutrient-rich habitats.
The researchers say that this is the strong evidence that stromatolites can form in hydrothermal lakes made by asteroid impacts.
This work builds on research from 2021 when the Korea Institute of Geoscience and Mineral Resources scientists first confirmed that the Hapcheon impact crater existed.
Now by finding biological structures in the crater the scientists have opened a new chapter in understanding how asteroid impacts and life on Earth are connected.
Future studies will look at old impact craters around the world to see if they have similar microbial structures.
The discovery shows us that even big cosmic events can sometimes help life grow or just hurt it.