There is nothing "under" the Earth in space, because space has no up or down. Earth floats in space, surrounded by a vacuum. Therefore, what lies "beneath" the Earth is actually the Earth's interior.
Here's a breakdown of the Earth's internal structure:
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Crust: The outermost solid layer of the Earth. It's relatively thin compared to the other layers.
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Mantle: A thick layer of hot, dense rock beneath the crust. It extends to a depth of approximately 2,900 kilometers (1,800 miles). The mantle is mostly solid, but it can behave like a very viscous fluid over long periods.
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Outer Core: A liquid layer primarily composed of iron and nickel. The movement of molten iron in the outer core generates Earth's magnetic field.
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Inner Core: A solid sphere made mostly of iron, located at the Earth's center. Despite the intense heat, the extreme pressure keeps it solid.
In the context of space, Earth hangs in all directions. Asking what is "under" the Earth is like asking what is to the left of the Earth – the answer depends entirely on your point of reference and direction in the near-vacuum.
