The mystery of how the moon formed is still puzzling scientists. The secret could lie deep within our planet.

Tech Insider
an artist's illustration shows a planet crashing into the Earth, causing a huge explosion, with debris flying towards the camera.
An artist's impression of how a violent impact about may have created the moon.

Tobias Roetsch/Future Publishing via Getty Images

Chunks of an alien world could be hidden deep within our planet, say scientists

Tech Insider
An artist's illustration shows a smaller planet, Theia, crashign into the early Earth, which looks barren and molten. Fragments of Theia are shown to migrate inside our planet.
An artist's impression shows the hypothesized collision between Theia and Earth

DENG Hongping and Hangzhou Sphere Studio

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