* The Sun is a star: It's a massive ball of hot gas, not a solid object with a "back" side.
* We see the Sun's surface: The light we see from the Sun comes from its outer layer, the photosphere.
* The Sun is vast: It's so large that even though we can't see its entire surface at once, it still dominates the sky.
What is beyond the Sun?
* Space: The Sun is just one star in a vast galaxy, the Milky Way. Beyond the Sun, there's the vast emptiness of space filled with other stars, planets, galaxies, and more.
* Other solar systems: There are billions of stars in the Milky Way, each potentially hosting its own planetary system.
* More galaxies: Our Milky Way is just one of countless galaxies in the observable universe.
In essence, there's no "behind" the Sun in the literal sense. It's a giant sphere of energy, and we see its illuminated surface. Beyond it lies the incredible vastness of the cosmos.
