The prevailing theory of the Moon’s formation centers on a cataclysmic impact between the early Earth and a Mars-sized protoplanet called Theia. This violent collision, occurring roughly 4.5 billion years ago, not only created our planet’s natural satellite but likely influenced Earth’s early growth, including the emergence of its mantle[[3]]. Now, new analysis of lunar samples returned by the Apollo missions, alongside data from ongoing lunar studies, is offering scientists a clearer picture of Theia’s composition and role in the solar system’s infancy.
Approximately 4.5 billion years ago, a colossal collision between the early Earth and a protoplanet named Theia dramatically reshaped our planet and ultimately led to the formation of the Moon. The impact was so forceful that vast amounts of debris were ejected into orbit.
This ejected material coalesced over time, forming the lunar body we know today. Some evidence suggests Theia’s influence extended beyond the Moon, potentially contributing to the development of Earth’s tectonic plates – a fundamental aspect of our planet’s geological activity.
Understanding the history of Theia is crucial to unlocking the origins of both Earth and its satellite, yet remarkably little is known about this ancient world. The study of planetary formation is a key area of innovation as scientists seek to understand the conditions necessary for habitable worlds.
Now, analysis of lunar samples is providing new insights into the composition and characteristics of this long-lost protoplanet.
