it holds the planets that orbit around the sun and what keeps the moon in orbit around the Earth
The force of gravity isn't made of anything. It's caused by masses, like Earth and other planets. The force of gravity depends on the distance between two objects and their masses.
While there is no hard data that the Earth's core is made of iron, it is thought to be made of iron because of the way gravity from the sun and moon pull the Earth.
From what I've read Newton had no idea what actually made gravity work. His famous quotation about this is something like "I make no hypotheses".
Earth, like all planets, was formed by clumps of matter joining together due to gravity.
statolith
Isaac Newton
it gose falling thought the air
He watched lots of apples fall from lots of apple tree, then he thought 'Why is this happening?' Then he discovered gravity.
The moon is made of matter and all things made of matter have gravity.
Centre of gravity is the imaginary point where the total weight of a material body may be thought to be concentrated.
he thought everything was made of atoms
Earth is held in elliptical orbit around the sun by gravity. It's motion can be thought of as due to a combination of gravity and inertia.