F=Gm1m2/r^2 where G is a gravitational constant
F≈m
the greater the mass of planets, the greater the gravitation force experiment by a person
gravity of a planet (a=GM/r^2)
the larger the mass of planet , the larger the gravity of planet
Weight = mass * gravity of the planet
therefore when neutron star has the same mass as our sun, the mass is larger and the gravity of it will be very large