# gravity

## Origin of gravity

## Synonyms for gravity

See more synonyms for on Thesaurus.com## Related Words for gravity

pressure, weight, consequence, solemnity, severity, urgency, significance, heaviness, force, momentousness, exigency, acuteness, concern, weightiness## Examples from the Web for gravity

### Contemporary Examples of gravity

So not only will the GOP have control in the Senate, it will move the center of gravity on Capitol Hill hard to starboard.

In the spring of 1933, few perceived Nazism with the gravity he did.

The powerful forces of gravity and magnetism channel matter into huge flattened spinning platters known as accretion disks.

The Asteroid Belt in the Solar System has many such gaps, created by the gravity of the Sun and Jupiter.

For other worlds, we usually have to rely on other data: fluctuations in gravity, or the gentle rocking motion known as libration.

### Historical Examples of gravity

Then there are twistings of mouths which never lost their gravity before.

Dr. BullivantNathaniel Hawthorne

This is because it is heavier than air, and gravity draws it to the ground.

Flying MachinesW.J. Jackman and Thos. H. Russell

She leaned forward, observing her profile; gravity seemed to be her mood.

Alice AdamsBooth Tarkington

A ton on some other planet, where the attraction of gravity is less, does not weigh half a ton.

Pax VobiscumHenry Drummond

Mr. Dodge looked distrustful; but John Effingham maintained his gravity.

Homeward BoundJames Fenimore Cooper

## gravity

## Word Origin for gravity

## gravity

A Closer Look: With his law of universal gravitation, Sir Isaac Newton described gravity as the mutual attraction between any two bodies in the universe. He developed an equation describing an instantaneous gravitational effect that any two objects, no matter how far apart or how small, exert on each other. These effects diminish as the distance between the objects gets larger and as the masses of the objects get smaller. His theory explained both the trajectory of a falling apple and the motion of the planets-hitherto completely unconnected phenomena-using the same equations. Albert Einstein developed the first revision of these ideas. Einstein needed to extend his theory of Special Relativity to be able to understand cases in which bodies were subject to forces and acceleration, as in the case of gravity. According to Special Relativity, however, the instantaneous gravitational effects in Newton's theory would not be possible, for to act instantaneously, gravity would have to travel at infinite velocities, faster than the speed of light, the upper limit of velocity in Special Relativity. To overcome these inconsistencies, Einstein developed the theory of General Relativity, which connected gravity, mass, and acceleration in a new manner. Imagine, he said, an astronaut standing in a stationary rocket on the Earth. Because of the Earth's gravity, his feet are pressed against the rocket's floor with a force equal to his weight. Now imagine him in the same rocket, this time accelerating in outer space, far from any significant gravity. The accelerating rocket pushing against his feet creates a force indistinguishable from that of a gravitational field. Developing this principle of equivalence, Einstein showed that mass itself forms curves in space and time and that the effects of gravity are related to the trajectories taken by objects-even objects without mass, such as light. Whether gravity can be united with the other fundamental forces understood in quantum mechanics remains unclear.