* The Sun is a sphere: It's a giant ball of hot gas, not a flat surface.
* No solid surface: The Sun doesn't have a solid surface like Earth. Its atmosphere gradually fades into space.
* Gravity holds it together: The Sun's immense gravity keeps all its material tightly bound, so there's no distinct "edge" or "back" to it.
What's beyond the Sun?
Space! The Sun is just one star in a vast galaxy, the Milky Way. Beyond the Sun, there are billions of other stars, planets, and galaxies.
