Stars, such as our sun, are giant balls of gas held together by gravity.
As a telescope moves, its mirrors are deformed by gravity while at the same time being shaken by wind.
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The model Southern is building, the AP1000, is totally new, with safety systems powered by gravity instead of electricity, a so-called passive design.
At Purdue University in Indiana, scientists are working on a reactor-like device that uses water circulated by gravity to keep the core cool.
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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.
Since both are affected by gravity they are attracted to each other, so the distribution of normal, visible matter acts as a proxy for the distribution of dark matter.
It is defined by gravity because that is the only way that it interacts it has no electric charge, and does not feel the strong and weak forces that bind atomic nuclei together.
Astronomers think this galaxy was torn apart by the gravity of a larger host galaxy that it orbited.
Some physicists would rather fiddle with Einstein's theory of relativity, for instance by making gravity weaker at extremely long ranges.
The galaxy's tidal wobble is, they think, being modulated by the gravity of something big within the Oort cloud itself.
The technique uses distant light amplified by the gravity of a massive star or planet to create an astronomical magnifying lens.
"Light coming toward us from a distant galaxy is bent by the gravity of a lump of matter in the middle, " explained Catherine Heymans of the University of Edinburgh.
The main source of meteorites, Chinese folklore notwithstanding, is the asteroid belt between Mars and Jupiter, a rough-and-tumble region of our solar system in which would-be planets are upset by Jovian gravity.
It was once thought that asteroids in the main belt occasionally collided with one another, sending fragments into orbital resonance bands where they could be affected by the gravity of Jupiter or Saturn.
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This would make sense if short-period comets started off in the Kuiper belt and were nudged into closer orbits around the sun by the gravity of the most distant of the giant planets, Neptune.
This exploits one of the predictions of Einstein's general theory of relativity: that the path of a beam of light (which is a straight line in empty space) is bent inwards by the gravity of a massive object.
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Patented in 1801 by Abraham-Louis Breguet, the tourbillon was designed to counteract the effects of gravity by isolating parts inside a revolving cage.
However, of the four fundamental forces, gravity is by far the weakest, and it took until 2002 before gravity's quantum nature was proven.
Presto -- the heavy socks defy gravity by clinging to her legs midway between ankle and knee.
Worthington Industries seemingly defied gravity by posting a blowout quarter amidst rising steel prices and a flagging economy.
Moreover, many asteroids are chunky masses of rock and dust loosely held together by very little gravity, like loosely packed peanut clusters.
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We have a cultural picture in our head of Isaac Newton as an upstanding British gentlemen who discovered gravity by having an apple fall on his head.
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And so you can artificially create that acceleration that makes you feel like you're in gravity just by rotating something like a centrifuge.
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At low speeds, an accelerometer determines the position of the lights by reading the pull of gravity.
This massive separation will allow it to measure the distortion of space as a gravity wave passes by.
Even so, at the moment, Annis leans toward dark energy simply being explained by a modified form of gravity.
Buildings of the finest neoclassical style hover in mid-air, floating individually yet held together by skylines and an unseen gravity.
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