This tag is for questions regarding 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 – attract 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 $$\nabla^2\Phi=4\pi G\rho$$.