It was a delta-v opposite to the direction of travel and that slowed Messenger enough so the relatively weak gravity of Mercury could capture the spacecraft and put it into an elliptical orbit around the planet rather than the Sun.

BBC: Juno Jupiter probe gets British boost

Like a human, it can quickly shift its center of gravity and change direction.

FORBES: Ten O'Clock Tech: Robots Dawning

Arresting, consistently absorbing stage pictures expertly follow the mournful flow of this slow-moving epic, while a powerhouse cast of singers and the Met Orchestra under the sure direction of Daniele Gatti ensure that the evening has both gravity and momentum.

WSJ: New Approaches to Themes Sacred and Sexual | Parsifal | Powder Her Face | Opera Reviews by Heidi Waleson

Both Pioneers act as though an extra force beyond mere gravity is tugging at them from the direction of the sun.

ECONOMIST: Physics

But something seems to have worried them, and they will now be reading the runes of a summit that ended with an unprecedented decision to cut EU spending, trying to evaluate whether this is a one-off or a symptom of a more troubling shift in Europe's centre of gravity - a move in a more sceptic direction.

BBC: Cameron touches raw nerve