About 4.5 billion years ago, a celestial object called Theia collided with early Earth, creating a fiery mess of rock and metal. From the remnants of this crash, two main bodies formed: Earth and its Moon.
So, where did this mysterious Theia come from? Scientists now believe it originated in the inner Solar System, possibly even closer to the Sun than we are today. This means that Theia might have been a neighbor of proto-Earth.
A study from the Max Planck Institute and the University of Chicago looked into this. Researchers analyzed samples from Earth, the Moon, and meteorites to compare various isotopes, which are different versions of elements.
Thorsten Kleine, a researcher from the Max Planck Institute, explains that the composition of an object tells its origin story. Just as ingredients in a dish remain distinct, the materials that made Earth settled based on their properties. For example, iron sunk into Earth’s core, while zirconium stayed in the mantle.
To understand Theia better, scientists also studied the isotope ratios from different parts of the Solar System. The ratios can be compared to a “fingerprint” of where an object came from. Much like poorly mixed cake batter, these ratios give clues about the materials that formed Theia.
Interestingly, the chemical signatures of the Moon and Earth are very similar. This similarity led researchers to focus on meteorites, which act as time capsules from the early Solar System. The inner Solar System has non-carbonaceous meteorites that formed in hotter conditions, whereas carbonaceous chondrites from the outer Solar System are richer in carbon and water.
The findings show that the Earth’s mantle is more closely linked with meteorites from the inner Solar System. However, the isotopes associated with Theia are unique and don’t match Earth’s building blocks. Timo Hopp, the lead author of the study, concludes that Earth and Theia likely shared a neighborhood in the same region of the Solar System.
Since that dramatic collision, the Moon has slowly been drifting away from Earth, moving about 1.5 inches (3.8 centimeters) every year.
This research, published in Science, adds to our understanding of how celestial bodies formed and interacted. As we explore, it helps us piece together the story of our cosmic origins. For those interested in delving deeper, you can read the full study in Science here.
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