Here's why:
* Newton's Law of Universal Gravitation: This law states that every particle in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
* Mass and Gravity: Mass is a fundamental property of matter, and it's the source of gravitational attraction. The more mass an object has, the stronger its gravitational pull.
* Even Small Objects: Even seemingly insignificant objects like a pencil or a grain of sand have mass, and therefore exert a gravitational force on everything else around them. However, the force is so small at these scales that it's practically unnoticeable.
In summary: Everything with mass has a gravitational pull, even if it's extremely weak. It's just that the force becomes significant enough to observe when dealing with objects with large masses like planets, stars, and galaxies.
