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: The more massive the objects, the stronger the attraction.
* Inversely proportional to the square of the distance between their centers: The closer the objects, the stronger the attraction.
Examples:
* The Earth and the Moon: The Earth's gravity pulls on the Moon, keeping it in orbit.
* The Sun and the planets: The Sun's gravity holds the planets in their orbits.
* Stars in galaxies: The gravity of stars pulls on each other, helping to form galaxies.
Important Note: While all objects with mass exert a gravitational force, the force is only significant when the masses are large (like planets or stars) or the objects are very close together.
