The cause of gravitational attraction does not change with the masses of objects.
The cause itself is still debatable because gravity has not yet been successfully incorporated into the Standard Model (which is the model which describes how particles behave and how they interact which each other).
There is a separate theory, called the theory of general relativity, which posits that energy causes spacetime to bend, and what we experience as gravity is actually just objects moving through this bent spacetime.
Most attempts to try to combine general relativity with the Standard Model predict that gravity is transmitted via the use of a messenger particle called the graviton. This is the way all other forces of nature work according to the Standard Model. In this view the cause of gravity would be the exchange of gravitons.
On a deeper somewhat technical level, scientists have discovered that all other forces (electromagnetic, weak nuclear and strong nuclear) can be traced back to certain symmetries of nature. These symmetries can be described via the use of mathematical groups. The same thing can be done for gravity and in that way gravity would automatically be caused by the Universe being symmetric under SO(3,1) (the Lorentz group) operations.
hrbbrh
The masses of the different objects The distance between them
Gravitational force between objects is proportional to the sum of their mass and inversely proportional to the square of their distance
The gravitational force is directly proportional to each of the masses.
A gravitational field is caused by masses. This will distort space and time in such a way that it affects other objects, and especially objects that are nearby.
-- the product of their individual masses -- the distance between their centers The formula for the gravitational force is given by: force = GMm/r² where G is the gravitational constant, M and m are the masses of the two objects and r is the distance between their centres.
The masses of the different objects The distance between them
Objects of greater mass have more gravitational pull.
Gravitational force between objects is proportional to the sum of their mass and inversely proportional to the square of their distance
It will be larger between the large objects. This force is equal to the universal gravitational constant times the two masses of the objects, all divided by the square of the distance apart the objects are.
The gravitational force is directly proportional to each of the masses.
A gravitational field is caused by masses. This will distort space and time in such a way that it affects other objects, and especially objects that are nearby.
Gravitational fields are caused by masses.
The gravitational pull is always present: there is no "when".
their masses increase
Yes. It is directly proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between them.
-- the product of their individual masses -- the distance between their centers The formula for the gravitational force is given by: force = GMm/r² where G is the gravitational constant, M and m are the masses of the two objects and r is the distance between their centres.
The gravitational attraction between two masses depends on the product of the masses. If either mass increases, then the product increases, and so does the strength of the forces between them.