The leading explanation for all of these mysteries is known as the giant impact hypothesis. According to this story, when the solar system was just getting started, a Mars-size protoplanet named Theia ...

Now, there’s mounting evidence that the blobs might be remnant shards from an ancient protoplanet named Theia that crashed into the Earth around 4.5 billion years ago, Science Magazine reports.

All the Latest Game Footage and Images from Protoplanet Express Embark on an exciting journey to explore distant star systems and witness the fascinating process of planet formation. In this ...

This massive event occurred when a Mars-sized protoplanet collided with the proto-Earth. The energy released vaporized rock and metal, forming a disk of molten debris around the planet.