If you drilled a tunnel straight through the Earth and jumped in, it would take you about 42 minutes to get to the other side.

If you drilled a tunnel straight through the Earth and jumped in, it would take you about 42 minutes to get to the other side.

A scenario often presented to introductory physics classes is that of a “gravity tunnel” — a tube drilled from one side of the Earth to the other through the planet’s center. The answer taught for nearly a half-century for how long a fall through such a hole would take was about 42 minutes and 12 seconds.

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