* There's no "behind" the sun in the traditional sense. The Sun is a giant ball of plasma and gas, not a solid object with a backside. It emits light and heat in all directions.
* What we see as the "back" of the Sun is actually just another side. As the Earth rotates, we see different parts of the Sun throughout the day.
* Space is vast. There's a lot of empty space between the Sun and the other planets in our solar system.
* Other stars are "behind" the Sun. But, because of the Sun's brightness, we can't see them during the day. At night, we can see countless stars in the sky, some of which are behind the Sun.
Let's imagine a scenario: If you could magically travel "behind" the Sun, you wouldn't find anything special. You'd just be in the vast emptiness of space, with the Sun in front of you.