A Canadian physicist has calculated exactly how long it would take to fall through an imaginary tunnel from one side of the Earth to the other.

The concept of a "gravity tunnel" has puzzled undergraduate students for years, with most physicists estimating that it would take precisely 42 minutes and 12 seconds.

However, publishing a new paper in the American Journal of Physics, Alexander Klotz of McGill University has shaved four minutes off that time.

This was a bit of a surprise to me. Basically, the way the Earth is structured, the gravity increases slightly as you go deeper towards the dense core, to about 110 per cent of its surface value, before getting weaker as you move through the core, reaching zero at the centre.

  • Alexander Klotz
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