The mass of an elephant would be the same on the moon as it is on Earth. Mass is a measure of the amount of matter in an object, and it does not change depending on the gravitational field that the object is in.

Weight, on the other hand, is a measure of the force of gravity acting on an object. It depends on both the mass of the object and the gravitational field that it is in. On the moon, the gravitational field is about one-sixth of what it is on Earth. This means that an elephant would weigh less on the moon than it does on Earth, but its mass would be the same.