- A dwarf planet usually is much smaller in size / in mass than other planets
- Pluto is a kind of dwarf planet
- Hence, pluto is a dwarf planet that has much smaller mass than other planets

- Pluto is a dwarf planet that has much smaller mass than other planets
- A dwarf planet is a kind of celestial object
- Therefore, pluto is a celestial object that  has much smaller mass than other planets

- Pluto is a celestial object that  has much smaller mass than other planets
- As the mass of a celestial object decreases , the surface gravity of that celestial object weakens
- Therefore, pluto will have much less gravity than other planets

Hence, pluto will have much less gravity than other planets
Question: The surface gravity of Pluto is the weakest of the nine planets because Pluto
Context: - A dwarf planet usually is much smaller in size / in mass than other planets 
- As the mass of a celestial object decreases , the surface gravity of that celestial object weakens 
- Pluto is a kind of dwarf planet 
- A dwarf planet is a kind of celestial object