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

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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

Earth's mysterious core is weirder than you think, and we're only just beginning to uncover its secrets

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An artist's impression of what the layers inside of the earth could look like. It shows the Earth quartered to reveal the crust, upper and lower mantle, and the outer and inner core, which are glowing bright at the center of the planet.
An illustration of Earth's core.

iStock / Getty Images Plus

Earth's mysterious core may be encased by an ancient ocean floor that has mountains 5 times taller than Everest

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An illustration shows the Earth's core wrapped in red matter representing a newly discovered structure that may be wrapping around the Earth's core.

The mysterious iron ball at the center of the Earth may have stopped spinning and reversed direction

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A 3D rendering of the Earth's layers, including its core.
A 3D rendering of the Earth's layers, including its inner core.

Getty Images

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