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Space debris frequently travels through our solar system. These pieces of rock and metal sometimes crash into Earth’s atmosphere. The friction burns them up as meteors. Occasionally, the fragments are large enough to survive the journey through the air and land on the ground. These surviving rocks are called meteorites. Scientists have studied thousands of these stones. Most of them come from three main sources: asteroids, the Moon, and Mars. However, a small number of rare meteorites come from unknown origins.
On June 1, 2026, researchers from the University of Colorado Boulder announced a significant discovery. They believe a specific meteorite, labeled NWA 12774, comes from a massive, early planet. This planet shattered into pieces billions of years ago. The journal Earth and Planetary Science Letters is scheduled to publish the peer-reviewed study on July 1, 2026. This finding suggests that the early solar system contained more large worlds than scientists previously thought.
Our solar system formed from a huge cloud of gas and dust approximately 4.5 billion years ago. This was a very unstable time. Objects in space collided with each other frequently. Some objects stuck together to form larger bodies. Others shattered into small pieces. The meteorite NWA 12774 provides a unique window into this chaotic era. It reveals a world that was trying to form at the same time as Earth and the other planets.
The scientists suggest that the parent world was very large. It might have been as big as the Moon or Mars. A massive collision shattered this body. The fragment that became NWA 12774 broke off during this event. It traveled through space for a long time. Eventually, it landed in the Sahara Desert in Northwest Africa.
Aaron Bell of the University of Colorado Boulder led the new study. He emphasized the importance of the discovery.
It’s incredible to think there was once a world this large. We only know it existed because a few fragments of it happened to land on Earth. These meteorites preserved evidence of a completely different pathway through which early planets developed.
The NWA 12774 meteorite belongs to a rare group called angrites. People have found more than 80,000 meteorites on Earth. Yet, only 68 of them are angrites. Their chemical makeup is very different from meteorites that come from asteroids, the Moon, or Mars.
Silicon dioxide, also known as silica, is a common material. It is found in quartz, sand, and nearly every known terrestrial planet in our solar system. However, silica is scarce in angrites. Because of this lack of silica, most scientists previously believed that angrites came from asteroids. They assumed these rocks formed in the main asteroid belt.
The researchers from CU Boulder looked closer at NWA 12774. They found a specific rock-forming mineral called clinopyroxene. This mineral had an unusual amount of aluminum. This detail was key. It told the researchers that the meteorite did not form on the surface. It formed deep underground under enormous pressure.
The pressure required to create the aluminum-rich clinopyroxene was extreme. It was greater than the pressure found at the bottom of the ocean. To be specific, forming this mineral required at least 17.5 kilobars of pressure. For comparison, the pressure at the Mariana Trench in the Pacific Ocean is only 1 kilabar. The Mariana Trench is the deepest point on Earth. The pressure inside the meteorite was seventeen times stronger than the deepest point in our oceans.
This finding led the researchers to a new conclusion. Only a very large parent body could have produced such pressure. The object that shattered must have been substantial. The researchers calculated that the parent body had to be at least 1,242 miles across. This is equal to 2,000 kilometers.
The story does not end there. The crystals inside the meteorite still have sharp edges. This is important. If the rock had formed deep underground for a long time, the edges would likely be worn down or altered by heat and pressure. The sharp edges suggest the rock did not stay deep underground for long.
The delicate chemical patterns in the stone also support this idea. These patterns could not have formed deep underground. Instead, the data suggests the rock formed underground but at shallow depths. This means the parent body was likely much larger than the initial estimate of 1,242 miles.
The researchers now estimate that the parent body was significantly bigger. It could have been the size of the Moon or Mars. The diameter might have been between 2,240 miles and 4,100 miles. This is equal to 3,600 kilometers to 6,600 kilometers. This would make it one of the largest objects in the early solar system.
This discovery raises important questions. Are there other meteorites that point to other lost worlds? Aaron Bell suggests that the answer is likely yes. Many meteorites are currently stored in museum drawers and laboratories. They have not been thoroughly studied. There are likely more protoplanets in our history that we do not know about.
The study of NWA 12774 changes how we view the formation of the solar system. It shows that large planets broke apart early in our history. These fragments traveled across space. Some eventually landed on Earth. By studying these rocks, scientists can piece together the history of our cosmic neighborhood. The evidence from this single stone points to a giant world that no longer exists. It serves as a reminder that the solar system was once a place of violent change and massive collisions. The search for more fragments continues. Each new discovery helps us understand the complex birth of our planetary system.
The peer-reviewed study will be published in the journal Earth and Planetary Science Letters on July 1, 2026. This publication will allow other scientists to review the data. They can verify the conclusions about the high-pressure formation and the size of the parent body. This process is essential for scientific progress. It ensures that the claims about the lost giant planet are accurate.
The discovery of NWA 12774 is not just about one rock. It is about the history of the solar system. It highlights the role of collisions in shaping planets. It shows that planets can break apart and still leave clues for future generations. The angrite class of meteorites is now seen as a key to understanding these lost worlds. Scientists hope to find more angrites. Each one could reveal details about other shattered planets. The early solar system was a dynamic and violent place. The meteorites that reach Earth are its messengers. They bring stories from deep time to the present day.
The University of Colorado Boulder team has set a new standard for analyzing rare meteorites. Their methods allowed them to detect the high-pressure minerals that revealed the rock's origin. This technique can be applied to other samples. It may uncover more evidence of early planetary destruction. The research connects geology, astronomy, and history. It shows how small pieces of rock can tell huge stories about the universe.
As scientists continue to search the skies and study the stones on the ground, the picture of our solar system’s past becomes clearer. The existence of NWA 12774 proves that large planets once existed where we least expected them. Their destruction was a normal part of planetary growth. The fragments remain as proof. They lie in deserts and museums, waiting to be understood. The story of NWA 12774 is just beginning. It invites us to look back 4.5 billion years. It asks us to imagine a solar system filled with giant, fragile worlds that came and went. The meteorite is a silent witness to that ancient chaos.