Gravity Is the Weakest Force

It’s a remarkable thought that a simple refrigerator magnet can lift a paperclip, completely overpowering the gravitational pull of the entire Earth. This everyday feat demonstrates gravity's true standing among the four fundamental forces of nature: the strong and weak nuclear forces, electromagnetism, and gravity itself. While the nuclear forces operate on a subatomic scale, the electromagnetic force holding the magnet to the clip is an astonishing 10^36 times stronger than the gravity pulling it down. This incredible weakness is one of the great (Review) mysteries of modern physics, often called the "hierarchy problem."

So why does this featherweight force dictate the orbits of planets and the structure of entire galaxies? Gravity’s power comes from its two unique properties: its infinite range and the fact that it is always attractive. The strong and weak forces, despite their immense power, act only over the tiny distances within an atom's nucleus. Electromagnetism, while also long-ranged, has positive and negative charges that tend to cancel each other out, leaving large objects like planets electrically neutral. Gravity, however, simply accumulates. Every bit of mass adds to the pull, and with no "anti-gravity" to counteract it, its influence becomes unstoppable on a cosmic scale.