One Star, Almost All the Mass.
One Star, Almost All the Mass. The Extraordinary Balance of Our Solar System The Sun holds 99.86% of the solar system's mass, yet the remaining fraction contains planets, moons, oceans, and the extraordinary possibility of life. Explore the Sun's mass, its 99.86% share of the solar system, and the gravity that shapes planetary motion and life on Earth. A Cosmic Weighing Scale An ordinary morning hides an extraordinary imbalance. Every morning, sunlight enters our homes, warms the ground and marks the beginning of another day. We rarely consider the enormous object responsible for this familiar experience. The Sun appears as a bright circle in the sky, seemingly no larger than the Moon. That apparent similarity is an illusion created by distance. The Sun is roughly 400 times wider than the Moon, but it is also about 400 times farther from Earth. Their similar apparent sizes allow the remarkable spectacle of a total solar eclipse. Yet even that comparison barely hints at the Su...