Here's why:

* Mars's Axial Tilt: Mars has an axial tilt of about 25 degrees, similar to Earth's 23.5 degrees. This tilt is what causes seasons.

* Mars's Orbital Period: However, Mars has a much longer orbital period around the Sun than Earth. It takes Mars approximately 687 Earth days to complete one orbit.

* Longer Seasons: This longer orbital period means that Martian seasons are about twice as long as Earth's seasons.

Let me know if you'd like to learn more about Martian seasons!