The Sun makes up about 99.8% of all the mass in the solar system.

Every planet, moon, asteroid, and comet orbiting the Sun together accounts for barely a fifth of one percent of the solar system’s total mass. The Sun alone holds roughly 99.8% of it, with Jupiter claiming most of what’s left — more than twice the mass of every other planet combined.

That overwhelming concentration of mass is exactly why the Sun’s gravity dominates the solar system, holding planets billions of kilometers away in stable orbits. It also means that, chemically, the solar system is overwhelmingly hydrogen and helium — the elements the Sun itself is made of — with rocky, metal-rich planets like Earth representing a comparatively tiny sprinkling of heavier elements.