What is 3D gravity comparison?

3D gravity comparison is like comparing how heavy different toys feel when you hold them, but you get to look at them from all sides.

Imagine you have two blocks: one is a small cube, and the other is a bigger, squishier ball. If you pick them up, they might both feel about the same weight. But if you put them on a special scale that can see how gravity works around them from every angle, like looking at them from above, below, and all around, it turns out one has more "gravity pull" than the other.

This is what scientists do with 3D gravity comparison: they use special tools to map out how strong gravity is in different places, not just on the surface of the Earth, but deep inside it too. It’s like giving the Earth a full-body check-up so we can understand what's going on beneath our feet, whether it's hidden caves, mountains, or even old buried treasure.

When scientists compare gravity from all sides, they can find places where something unexpected is hiding, like a mountain range or an underground lake. It’s like when you feel a bump in your toy and guess what’s inside without opening it up!