In astronomy, our Sun’s mass is the definition of one solar mass, the standard unit used to compare the masses of stars and other celestial objects. This single measure anchors our understanding of the cosmos, allowing astronomers to place everything from small planets to supermassive black holes on the same scale. 🌌 A Star That Holds Our Solar System Together Our Sun contains about 99.86% of all the mass in our solar system. Its powerful gravity keeps every planet, moon, asteroid, and comet in orbit, and its influence reaches far beyond the planets, tugging on icy bodies in the most distant reaches of the solar system. While it may seem enormous to us, our Sun is far from the largest star in existence. Even so, its mass is the standard by which astronomers measure other stars and celestial objects. 🌞 Our Sun’s True Nature Our Sun is classified as a G2V star, meaning it is a yellow‑white main‑sequence star of moderate temperature. The “G2” refers to its surface temperature and spectr...