* Gravity is a fundamental force of nature: It's one of the four fundamental forces (along with electromagnetism, weak nuclear force, and strong nuclear force).
* Mass is the source of gravity: The more massive an object is, the stronger its gravitational pull.
* Everything with mass exerts a gravitational pull: This means even small objects like a pencil or a grain of sand have a gravitational force, although it's incredibly weak.
Examples:
* Planets: Planets orbit stars due to the gravitational force between them.
* Stars: Stars form by gravity pulling together massive clouds of gas and dust.
* Galaxies: Galaxies are held together by the combined gravity of all the stars, gas, and dust within them.
* You and me: We experience the Earth's gravitational pull, keeping us grounded.
* Apples falling from trees: This classic example demonstrates the Earth's gravity pulling the apple downwards.
Important Note: While all objects with mass experience gravity, the force is only noticeable when the objects are massive or very close to each other.
