Interesting fact: The Sun contains 99.86% of the total mass of our entire solar system.
The answer: The Sun has a mass of about 1.99 × 10^30 kilograms, equivalent to roughly 2 nonillion tons.
The Sun's mass is enormous compared to all the planets combined, which is why its gravity dominates the solar system, keeping planets, asteroids, and comets in orbit. This mass is mostly hydrogen and helium undergoing nuclear fusion, producing the energy that sustains life on Earth. Scientists estimate the Sun's mass by studying the orbits of planets and spacecraft, which respond to its gravitational pull.
For broader background on the Sun and nearby planets, see Solar System Guide, a dedicated guide to the Solar System.
