can you give some help on what gravity pulls matter together?
87660
Any matter with mass also has the property of gravity. There are two basic schools of thought about what gravity itself is. One idea is that the attractive properties of gravity result from two or more chunks of matter exchanging an elementary particle called the "graviton." One example would be the gravitational attraction between the Earth and the Moon---each planet exchanges gravitons. So far, these graviton particles have not been observed.\n\nAnother idea, this one from Einstein's theory of relativity, says that matter (mass) actually bends the fabric of space, sort of like what would happen if you placed a bowling ball on a sheet of thin rubber. The resulting deformation of space by mass results in other objects to follow the shape of the deformed space. In the Earth/Moon example, the Moon orbits around Earth because it's simply following the shape of the wrinkle in space made by Earth's mass.
1093836
Centrifugal force and gravity.
439003
you and a friend go outside and do an experiment. stand on each others heads and you will get your answer. That pressure you feel on your head is the mass of your friend PUSHING down on the earth.That my dear lad is gravity.
30388
Gravity, the strong nuclear force, the weak nuclear force, and electromagnetic force.
151142
The gravitational attraction is felt between any two objects (assuming that they have mass).  Gravitation is the weakest fundimental force, so the attraction between two 60 kg persons sitting 6 meters apart is 6.67 nN.\nTHe bad news is that you can't prevent this force from acting, however it is a very small force.  I don't think you need to worry about gravity as the source of your 'physical' attraction.
279317
gravity.\n\nany shape of mass that is not spherical is gravitationally unstable
247359
Mass interacting with gravity
524636
If the forces are both acting in the same direction, add them together. = 65 Newtons
1110928
Einstein explained gravity as a warp in the time-space continuum.  The best explanation I've ever seen was at a museum.  It's hard to explain with words, but imagine a square piece of fabric stretched taut on all 4 edges.  Now, place a weight (a ball, say, to represent a planet) in the center of that fabric.  It causes the fabric to stretch, and distort.  And any small items (marbles, say) that get in the area near the ball will roll toward the ball.
296792
Your experimental model is corrupt in terms of current known information about matter and energy in a space-time continuum.  No prediction or calculation can be applied.\nWith two point masses, the only force in the system would be do to gravity.  This is an assumption based upon multiple moving masses in what we would call the normal physical universe.\nIf the distance between their centers (d) was sufficiently small, the points would be touching one another and no force would be exerted on the masses.  If the distance was sufficiently large, then it is possible that the force would be so small that the masses would not move.  Only in a finite range of distances would any gravity possibly exist.\nOne can make no assumptions about G as a gravitational constant, since G assumes that one of the masses is the earth.  One would need additional information about the masses to solve the problem.
357562
What is this gravity that you mention?  :P\n\nGood point tho, funny how it didn't exist until very recently in our history.  *hugs*
1038202
Because your question is specifically about gravity, I will ignore the temperature of the core. The thing that is important to realize is that gravity is an attractive force. Although it's a bit complicated, we can answer your question by considering gravity an attraction between two atoms.\n\nThe Earth pulls us down as if there were a large gravitational pull coming from the center of the planet, but this is not actually the case. The pull is actually coming from each atom of the Earth independently. It's like if you had two friends who each had a rope attached to your belt buckle. If both are standing in front of you and pull hard, you'll feel a pull that is twice as hard as each alone. If one is standing a bit to the right and the other is standing a bit to the left, and they both pull towards themselves (and they pull just as hard as each other), you will be pulled straight forward.\n\nIn the center of the Earth, it would be like you had lots of friends each with a rope attached to your belt buckle, and they were standing all around you in a circle. If they all pull, they will all cancel each other out -- you won't move at all! You wouldn't even feel it.\n\nSo, to answer your question, in the center of the Earth you would feel pretty much the same as if you were in space -- weightless.
142200
The density of it causes it to have more mass, making it have more gravity, meaning it attracts to itself more than anything else on earth pulling it to the center.\n\nMore mass = more gravity.\n\nGravity pulls two objects together. We don't see this because things we see it's too small to notice, but say the earth is attracted to the sun and that's what keeps us in orbit, a black hole is made up of material that is VERY dense and that's why it pulls everything in so strongly, so strong even light doesn't escape. \n\nSo the densest layer of a planet is in the center, and the least dense is on the outer, unless another scientific principle outwieghs that one in application.\n\nImagine a block of iron and a bag of dirt, which would you feel pulling toward the earth stronger?\nYou would percieve the block of iron going toward the surface of the earth stronger than a bag of dirt, but if you think about it it's also moving toward the center of the earth. So that's what happens, the metal is in the middle and the dirt is on the surface.
511118
gravity draws everything towards the centre
442513
The gravitational force holds it into a spherical shape.
578115
I think that the gravitational attraction between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them.\nF = G * m1*m2/r²
921042
If it has a strong gravitational field, light will bend towards it. No sucking involved.