Ebb and Flow deliberately plunged into a lunar mountain in December after mapping the moon's gravity field in unprecedented detail.
One of them was determining the exact moment at which an astronaut must fire a rocket booster to enter the moon's gravity field.
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.
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.
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.
The first maps not only record the three components but also compare their signals to the best available gravity field models assembled from existing space- and ground-acquired data-sets.
In World War I the Allied strategy was to engage and defeat the center of gravity of the Central Powers, the German field army.
In a culture that encourages the constant search for the limits of human achievement, we, the fans, the consumers of popular sports entertainment, revel in record-breaking, gravity-defying, barely believable feats on the field of play.
They predict that about 73% of the Universe is made up of dark energy - a pervasive energy field that acts as a sort of anti-gravity to stop the Universe from contracting back in on itself.
BBC: Dark Matter: Experiment to shed light on dark particles
At Oort-cloud distances, the strength of this combined gravity adds up to the same sort of force as that exerted by the solar gravitational field, enfeebled as it is by its remoteness from the sun.
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