Why is the strength of gravity different on different planets? E.g: The gravitational pull is less stronger on the moon

Question: Why is the strength of gravity different on different planets? E.g: The gravitational pull is less stronger on the moon than on Earth
- Keywords:
  earth,
  gravity,
  moon,
  planet
Asked by Ayayai to Chris on 16 Mar 2016.
- Chris Conselice answered on 16 Mar 2016:
  
  The gravity on a planet or moon depends on the mass of the object and its size. The moon is much less massive than the earth, so the gravity is smaller. On jupiter it would be much larger the gravity due to its higher mass. This is known as Newton’s law, named after Isaac Newton who discovered it in the 17th century.

Ayayai commented on 16 Mar 2016:

Oh I see the smaller the size it is the less strong Gravity it is and the larger the size it is the more strong gravity it has.

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Lily commented on 17 Mar 2016:

Excellent question Ayayai
Sensational response Chris

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Question: Why is the strength of gravity different on different planets? E.g: The gravitational pull is less stronger on the moon than on Earth