Our Sun – the heart of our solar system – is a yellow dwarf star, a hot ball of glowing gases. Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest particles of debris in its orbit. Electric currents in the Sun generate a magnetic field that is carried out through the solar system by the solar wind – a stream of electrically charged gas blowing outward from the Sun in all directions.

The Sun is the largest object in our solar system, comprising 99.8% of the system’s mass. Though it seems huge to us, the Sun isn't as large as other types of stars.

Earth orbits the Sun from a distance of about 93 million miles. The connection and interactions between the Sun and Earth drive our planet's seasons, ocean currents, weather, climate, radiation belts, and aurorae. Though it is special to us, there are billions of stars like our Sun scattered across the Milky Way galaxy.

Go farther: Explore our Sun In Depth ›

Ten Things to Know About the Sun

10 Need-to-Know Things About the Sun



If the Sun were as tall as a typical front door, Earth would be about the size of a nickel.


Most Massive

The Sun is the center of our solar system and makes up 99.8 percent of the mass of the entire solar system.


Different Spins

At the equator, the Sun spins once about every 25 days, but at its poles the Sun rotates once on its axis every 35 Earth days.

Sun Shines in High-Energy X-rays


Can’t Stand On It

As a star, the Sun is a ball of gas (92.1 percent hydrogen and 7.8 percent helium) held together by its own gravity.



The Sun does not have any rings.


Under Study

Many spacecraft constantly observe the Sun, helping us keep an eye on space weather that can affect satellites and astronauts.


Energy For Life

Without the Sun's intense energy, there would be no life on Earth.


Nuclear Fusion

The Sun's core is about 27 million degrees Fahrenheit (15 million degrees Celsius).



But orbited by eight planets, at least five dwarf planets, tens of thousands of asteroids, and up to three trillion comets and icy bodies.


What We See

The Sun’s visible surface sometimes has dark sunspots, which are areas of intense magnetic activity that can lead to solar explosions.

Two Long Filaments

Pop Culture

Pop Culture

The Sun has inspired mythological stories in cultures around the world since ancient times.

The Sun in Time

More recently, the Sun has adorned everything from album covers, such as Sublime's iconic 1992 debut, to packages of raisins. It continues to influence stories in comics, theatrical films, and everything in between.

If you're Superman (or a fellow Kryptonian), your powers are heightened by the yellow glow of our Sun, and you can even dispose of dangerous materials like Superboy once did, by hurling them into the Sun. And in the 2007 film "Sunshine" – the Sun is dying, leaving Earth in a deep freeze. To save humanity, a crewed spacecraft is sent to reignite the Sun with a bomb, though things don't go quite as planned.

Kid-Friendly Sun

Illustration of the sun

Kid-Friendly Sun

The Sun is a star. There are lots of stars, but the Sun is the closest one to Earth. It is the center of our solar system.

The Sun is a hot ball of glowing gases. It keeps our planet warm enough for living things to thrive. It gives us light so we can see.

Eight planets move around the Sun. We call that an orbit. The planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Lots of smaller worlds orbit the Sun. Pluto is a dwarf planet beyond Neptune. There are many asteroids and comets that go around the Sun, too.

Visit NASA Space Place for more kid-friendly facts.

NASA Space Place: All About the Sun ›
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