Here's why:
* Mass: Every object in the universe has mass, a measure of how much matter it contains.
* Gravity: Gravity is a fundamental force of nature that attracts any two objects with mass. The more massive an object, the stronger its gravitational pull.
Key Points:
* Gravity is what keeps us on Earth and what holds the planets in orbit around the sun.
* The force of gravity depends on the masses of the objects involved and the distance between them.
* The famous physicist Isaac Newton is credited with first defining the law of universal gravitation.
