Why does the weight of an object change and mass of an object does not change when the object is moved to a different planet

weight changes by changing place (planet) as it depends on the gravity of planet _ gravity increases as mass of planet increase _

weight depends on 1 - mass of body.

2 - place (planet where object exist.)

3 - distance from centre of planet (earth).

while mass defined as the amount of matter inside object.

and it's constant value doesn't change by changing the the place.

I hope that it's useful for you