By math.
gravity
they are attracted to the sun bye gravity
Discover gravity
Gravity
i don't know the answer .... but i think he discover gravity when he was sitting under an apple tree and an apple fell on his head and he discover.
Isaac Newton did not discover gravity, but he is credited with developing the universal law of gravitation and explaining the mechanics of gravity in his work "Philosophiæ Naturalis Principia Mathematica." The concept of gravity was known to ancient civilizations, and Newton's contributions built upon existing knowledge.
by test ing
gravity
Discover gravity
he was the one to discover the force of gravity.
gravity
well, to be honest, if sir Issac Newton didn't discover the law of gravity, someone else probably will came up with that.