The Sun is the star that holds the solar system together and affects Earth's weather, climate and radiation. Learn about its features, history, culture and missions from NASA.

Our solar system has one star, eight planets, five officially named dwarf planets, hundreds of moons, thousands of comets, and more than a million asteroids.

Learn about the birth, life and death of stars, and how they are classified by mass and nuclear fusion. Find out how many stars are in the universe and in our galaxy, and see stunning images of stellar phenomena.

Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

Learn about the birth, types, and death of stars in our galaxy and beyond. Find out how stars are classified by their surface temperatures, sizes, and lifespans.

solar system, assemblage consisting of the Sun—an average star in the Milky Way Galaxy—and those bodies orbiting around it: 8 (formerly 9) planets with more than 210 known planetary satellites (moons); many asteroids, some with their own satellites; comets and other icy bodies; and vast reaches of highly tenuous gas and dust known as the ...

The Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system. It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star.

Learn about the process of star formation, from the collapse of gas and dust clouds to the birth of protostars and protoplanets. Explore the different stages of stellar evolution, from red giants to supernovae, and how they affect the planets and life.

Learn how the Sun works, why we study it, and what will happen when it dies. Explore the Sun's structure, activity, effects on Earth, and more with images and videos.