Here's why:

* Universal Force: Gravity is one of the fundamental forces of nature. It's a force of attraction between any two objects with mass.

* Mass Matters: The more mass an object has, the stronger its gravitational pull.

* Distance Matters: The force of gravity weakens rapidly with distance.

Therefore, even tiny particles like dust and photons are affected by gravity, although the effect might be very small.

Here are some examples:

* Planets orbiting stars: Gravity keeps planets in their orbits around stars.

* Galaxies forming: Gravity pulls together vast amounts of gas and dust to form galaxies.

* Black holes: These are extremely dense objects with such strong gravity that nothing, not even light, can escape.

While gravity affects everything, its impact might be negligible in some cases due to the small mass of objects or vast distances between them. However, the principle remains the same: gravity is a universal force that governs the movement and interactions of all objects in the universe.