This tag is for the questions regarding to the Newtonian model of gravity in which the force between two objects is given by $~GMm/r^2~.$ it is a natural phenomenon by which all things with mass or energy-including planets, stars, galaxies, and even light-are brought toward (or gravitate toward) one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
The Newtonian model of gravity in which the force $$(F)$$ between two objects of mass $$M$$ and $$m$$ situated at a distance $$r$$ is given by $$F=\frac{GMm}{r^2}$$, where $$G$$ is the Gravitational constant and its value is $$G=6.674×10^{−11}$$ m$$^3$$⋅kg$$^{−1}$$⋅s$$^{−2}$$ (in SI units).
Newtonian gravity can also be formulated in terms of Poisson's equation $$\nabla^2\Phi=4\pi G\rho$$.