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afton
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What causes gravity?
GR's gravitational model is incomplete in another major aspect. There is no mechanism by which gravitation arises. The curved space-time model works for simple systems (like the solar system), but it falls apart on galactic (and larger) scales. Also, curved space-time is incompatible with the flat fields of quantum physics, which prevents the extension of gravitation to small scales.yogi said:In Einstein's theory (General Relativity) matter conditions local space which Einstein regarded as a continuum. It has met every test so far, but it is incomplete in one major aspect - it does not predict what the Gravitational constant is - this factor must be put into the equations by hand - it is determined from experimental measurment, not from theory.
Let's put the space-time curvature aside for now. I think what you are asking is what force keeps our feet planted on the ground (you know that it's gravity) and why is that so.afton said:What causes gravity?
Gravity is a fundamental force of nature that causes objects with mass to attract each other. It is responsible for keeping planets in their orbits around the sun, and for objects falling towards the ground.
The current understanding is that gravity is caused by the curvature of space-time, a concept proposed by Albert Einstein's theory of general relativity. Objects with mass cause this curvature, and other objects with mass are attracted to it, creating the force we experience as gravity.
Gravity works by warping the fabric of space-time, creating a gravitational field that objects with mass are pulled into. The strength of this force is determined by the mass and distance between two objects.
Yes, gravity works the same everywhere in the universe. However, its strength may vary depending on the mass and distance between objects. For example, the gravity on Earth is stronger than the gravity on the moon because Earth has a larger mass.
No, gravity cannot be turned off or manipulated. It is a fundamental force of nature and is always present. Scientists are still studying ways to manipulate gravity, but it is currently not possible with our current technology and understanding of the universe.