"Gravity" is responsible for the existence of planetary orbits, and for their shapes and periods. It's also the reason for the spherical shapes of the planets, and for the existence of atmospheres, in the case of those planets that have any.
Gravity exists throughout the universe and at every point in it. Because of the existence of gravity everywhere, there is a pair of forces that attracts every pair of masses toward each other.
gravity and radiation pressure from thermonuclear fusion.
Newton proved this. Because if you raise an object and remove the support, it will fall towards the Earth (down). That is because the Earth has the largest mass nearby. That is gravitational attraction.
The core is necessary for a star's existence, it's the engine that keeps it from collapsing. When this engine runs out of fuel or its fuel vanishes, gravity overcomes and contracts the star until matter from the radiative zone is compressed enough to start fusing hydrogen again to counterbalance gravity.
Science has never proved god.
There are thousands of gods, you should be more specific in your question. Nobody has ever proved the existence of any god.
Benjamin Franklin proved the existence of electricity.
She believes in the existence of God. The existence of gravity is a fact.
It proved that Isaac newton's Theories Of Motion And Gravity are correct.
it is due to the existence of the gravity or the acceleration.
The existence of francium in cosmos was not proved.
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J.J. Thompson proved the electron's existence through the cathode ray experiment.
he proved that there was a force called gravity. the moon's gravity causes water to rise.
Neptune
Ernest Rutherford