How does the mass of an astronaut change when she travels from earth to the moon? how does her weight change?

Mass does not change

Weight redueces on the moon

Explanation:

The mass of an object never changes with respect to the astronomical body it is on. The mass of an object is the resistance it provides to a force which is applied.

A 1 kg object is an 1 kg object anywhere in the universe.

Weight is the affect of an astronomical object's gravity on it

where,

m = Mass of the object

g = Acceleration due to gravity

=Acceleration due to gravity on Earth = 9.81 m/s²

=Acceleration due to gravity on Moon = 1.62 m/s²

Weight on Earth

Weight on Moon

Dividing the equations we get

The weight of the astronaut on the moon will be 0.165 times the weight on Earth.

So, the weight of the astronaut will be reduced on the moon