Eli5: How do we know that the Hollow earth theory is false if we have never been in the center of the planet?

Question

Eli5: How do we know that the Hollow earth theory is false if we have never been in the center of the planet?

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Answer 1

The centre of the Earth is molten, we have attempted to drill down deep but the technology will only let us get down a relatively short way and it is extremely expensive to drill down.