Okay... Lets have a go on gravitational field (basics first)

It's like an invisible "pulling zone" created by massive objects, such as planets or stars. The bigger the mass of an object, the stronger its gravitational field. This field is what causes things to fall to the ground and keeps planets orbiting the Sun.

The gravitational field strength (g) at a point is the force per unit mass experienced by a small test mass placed at that point. On Earth's surface, g is approximately 9.8 N/kg.