The gravity on the pulsar's surface is 300 billion times as great as the gravity on Earth.

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This has allowed scientists to retrieve information about the Arctic Ocean region's gravity field, its surface circulation, and the thickness of its sea-ice cover.

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Here on the Earth's surface we live at the bottom of a gravity well.

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The neutron star's intense gravity raises fearsome tides on its partner's surface, tearing material off and pulling it into a disc around the neutron star.

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Since Eros's gravity is so small (a person on its surface would weigh only a few dozen grams), this dust probably could not have fallen into the craters in the way that it would on a heavier body.

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You drill two horizontal wells and inject steam into the upper one, draw bitumen by gravity into the lower well and bring it to the surface.

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When we see a notable change in the gravity field, we can sync up this change with surface topography features such as craters, rilles or mountains.

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This is a special type of Earth model which traces its idealised "horizontal" surface - the plane on which, at any point, the pull of gravity is perpendicular to it.

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The gradients seem less marked over the oceans where a lot of gravity field information has already been determined by spacecraft that measure sea-surface topography.

BBC: Europe's Goce satellite probes Earth's gravity