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No one knows for certain what gravity is.

Newton explained how gravity acts but not what gravity is.

Einstein's General Theory of Relativity says that gravity is the warping of spacetime in response to the presence of mass and objects then following the warped paths resulting in spacetime. This model has explained many previously known observations (e.g. the anomalies in Mercury's orbit) that Newton's work could not and made predictions (e.g. bending of light paths by gravity, black holes) nobody could have otherwise imagined.

However even the explanation of General Relativity about gravity may not be complete or totally correct. If Quantum Mechanics and General Relativity can someday be successfully combined it may again be necessary to change our understanding of gravity.

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Related Questions

Because mercury is less massive than earth things there would weigh?

less on Mercury compared to Earth. This is due to the weaker gravitational pull of Mercury, which is only about 38% of the gravity on Earth. As a result, objects weigh less on Mercury because there is less force pulling them towards the planet's surface.


What effect does surface gravity have on things on a planet?

It makes something weigh more or weigh less. Also it makes something stay in the planet's atmosphere.


Are things heavier on Mercury or earth?

Mercury has less gravity, so objects on Mercury would weigh less than they would on Earth


Do you way less on Uranus?

there is less gravity so you weigh less


Why do astronauts not weigh less in space?

they do-there is no gravity


Why is your gravity less on other planets?

On other planets your gravity doesn't change. Your weight however changes based on the mass of the planet. For example, on a planet with less mass than Earth, a person will weigh less than they normally do.


If you weigh 100lbs on earth you would weigh 16.6lbs on the moon and why?

On the moon, gravity is about 1/6th of the gravity on Earth. Therefore, if you weigh 100lbs on Earth, you would weigh approximately 16.6lbs on the moon. This is because the force of gravity pulling you toward the moon is much weaker compared to the force of gravity pulling you toward Earth.


Would you weigh more or less on mercury than on earth?

You would weigh less on Mercury than on Earth due to its lower gravity. Mercury's gravity is about 38% of Earth's gravity.


What effect does the surface gravity have on the things on a planet?

It makes something weigh more or less. Also it makes something stay in the planets


What effect does surface gravity have on the things on a planet?

It makes something weigh more or less. Also it makes something stay in the planets


Does Mars' gravity affect other objects?

Yes, Mars' gravity affects other objects just like any other planetary body. The strength of Mars' gravity is about 38% of Earth's gravity, so objects will weigh less on Mars than on Earth. This weaker gravity also influences things like the orbit of spacecraft around Mars.


Why would you weigh more on earth then moon?

The reason we weigh the amount we do is because the gravity is as strong as it is. However on the moon the gravity is not as strong, therefore we weigh less.