Our ability to move is dependent on how forcefully our muscles contract, which in turn is referred to as muscle tension. muscle tension is determined by

Muscle tension is determined by lots of factors including: (1) muscle force, depending on the amount of force that we exert into our muscles, the muscle tension also varies. (2) angle of pull. This is also a relevant aspect in determining the muscle contraction. 

Well, they start from the smallest one, in this case Mercury , then they go to the next, Mars, followed by Venus, Earth, Neptune, Uranus, Saturn and finally end with the biggest one, Jupiter.