why is there gravity?

Question

why does it exist

what is the scientific explanation

Answer 1

No one knows the answer to that. However, matter seems to cause a "dent" in space. The greater the mass of this matter, the greater the "dent" it creates. Other matter (with less mass) gets influenced by matter with larger dents. This causes small matter to orbit and free fall toward big matter.

However, is this "dent" magnetic or electric? No one knows. However it is a fascinating thing to ponder!

Answer 2

Matter creates a "dent in space" as he put it, BUT matter releases energy. So gravity is an inverse of energy released. For every action there is an equal and opposite reaction. So to compensate for the energy expelled from a body of matter a suction is created as the opposite reaction. Incomplete matter (seeing as it all lost energy somehow even if just through creation) will attract to other incomplete matter until all matter is brought back together again and form a space time singularity.

Imagine all matter squeezed together in a single point (or a family reunion). The single point goes boom. This releases a lot of energy in the form of matter which is accelerating. All this matter starts off again from square one missing energy and the whole process of everything attracting starts all over again.

At least that's according to Stephen Hawking's views. Who knows ... Sounds reasonable to me.

P.S. it isn't a magnetic field, because the moon has gravity but no evident magnetic field, ditto Mars.

Answer 3

well: take it as a postulate that 2 bodies attract at a force proportional to their masses and inversely proportional to the square of their distances.

The concept of dent as explained by others is not totally proved. Infact, many physists have postulated the idea of anti-gravity for some rare situations i.e. 2 bodies repel each other

Answer 4

There are two answers to this, and I do not understand their relationship. One, as has been mentioned, is that mass causes a "dent" or depression in the fabric of spacetime. But the other is that gravity is the exchange of particles called gravitons (in gravity waves). This is hypothetical; no such waves or particles have been detected yet.

Answer 5

It is a form of energy c2=E/m. It is due to the heat energy within a mass. Energy ALWAYS evidences its presence within a mass in some manner. Were our planet to have no heat energy, then it would have no gravitational field. http://timebones.blogspot.com has a manner to prove this to be true, found in the second half of "The Problem and Repair of Relativity".

I had set up an experiment to prove what I have referred to, and invited the media to witness it - TV channel 3 and 8 in Western Michigan, but they were not interested. If you represent an organization that has an interest in seeing a gravitational field formed and collapsed, post the name of your organization on this site and I will contact it.

Answer 6

Ask Einstein.
http://en.wikipedia.org/wiki/General_theory_of_relativity

Answer 7

Assuming this is a serious question, gravity exists so you don't fall off the earth!!

Answer 8

According to the law of universal gravitation, the attractive force between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them.

F = G m1 m2 /R^2

Answer 9

Because if there was no gravity, everything would just be floating around space.

I think you mean, "How is gravity made?", right?

Answer 10

To keep things a float here on earth.