Here's why:
* Gravity is a fundamental force: It's one of the four fundamental forces of nature (along with electromagnetism, the strong nuclear force, and the weak nuclear force).
* Mass creates gravity: The more massive an object is, the stronger its gravitational pull.
* Every object has mass: Even tiny objects like a pencil or a grain of sand possess mass, and therefore have a gravitational pull.
However, the gravitational force between everyday objects is extremely weak. It's only noticeable when one of the objects is incredibly massive, like a planet or a star.
Think about it this way: you and your friend exert a gravitational pull on each other, but it's so small you wouldn't even notice it. However, the Earth's massive gravity is strong enough to keep you firmly planted on the ground.
