Model of Earth's gravity
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'Potato Earth' shows variations in planet's gravity

A misshapen globe that looks like a giant potato in space is the best attempt to describe the variation in gravity across the surface of the Earth.

The "potato earth" is the work of scientists working on Europe's Goce satellite, clearly illustrating how the tug we feel from the mass of rock under our feet is not the same in every location.

Gravity is strongest in yellow areas; weakest in blue ones - although the differences are, in reality, very subtle.

Video courtesy of the European Space Agency