Understanding the nature of gravitational energy

Gravitational energy is the energy of an object's in relation to its position in a gravitational field. but how is it defined and why is it always negative.
This 'cheatsheet ' video looks at these questions

Look at my longer video on this topic

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If you create a new gravitational constant J=4(pi)G then you can write Grav(field strength)=J m1/4(pi)r(squared)
Since 4(pi)r(squared) is the surface area of a sphere then you can see that the Grav(field strength) depends only on the mass m1 and the distance away from the center of mass.