Mass changes, not weight.
Western science has that upside-down.
Weight is fixed as the constituency of the "gravitating" body itself,
whereas mass is only relative to the body to which it is accelerating.
Gravity is a one-body acceleration
as in the gravitation of a single planet,
whereas mass requires two bodies:
one providing the gravity, the other
having a relative "mass" as in a ball
accelerating toward the planet.
The mass of the ball is relative to
the planet, whereas the weight
is not, rather intrinsic to the ball
irrespective of another body.