Here's why:

* Gravity: The Sun's massive size creates a strong gravitational pull that keeps the Earth in orbit.

* Orbital Path: The Earth travels in an elliptical path around the Sun, taking approximately 365.25 days to complete one orbit.

* Moon's Orbit: The Moon orbits the Earth, not the other way around.

* Mars' Orbit: Mars also orbits the Sun, just like the Earth.

Let me know if you have any other questions!