4. which scientist developed the theory of gravitation and used it to explain the orbits of celestial bodies?

a. johannes kepler
b. galileo galilae
c. isaac newton
d. copernicus

Isaac Newton developed the theory of gravitation and explained the orbits of celestial bodies.

Explanation:

Newton's law explains about the “strength of the gravitational force between two objects” that drops off when light gets dimmer by moving away from it. It is mathematically known as an “inverse square law”.  

The next method to visualise the drop-off in the field is to imagine the gravitational field around an object in series of concentric spheres. The same amount of gravitational field is represented by each sphere, but the spheres farther from the object are bigger, so that same amount of field is spread thinner, over a larger area.

you would travel west