The Earth revolves around the Sun because of two things: gravity and motion! Imagine the Earth as a ball tied to a string, with the Sun pulling it in a circle. The Sun’s gravity is like the string, tugging the Earth toward it. Gravity is a force that pulls things together, like how you fall back to the ground when you jump.
Long ago, when the Earth formed, it was already moving in space. This movement came from a spinning cloud of gas and dust that made our solar system. As the Earth moves, the Sun’s gravity keeps it from flying away, making it travel in a big circle, or orbit, around the Sun. This trip takes one year—365 days!
The Earth keeps moving because of a science rule called inertia. Inertia means things keep going unless something stops them. In space, there’s no air or friction to slow the Earth down, so it keeps orbiting. This revolution gives us seasons, like summer and winter, as different parts of Earth tilt toward or away from the Sun. Isn’t it amazing how the Earth dances around the Sun to give us our year?