The Earth is the third planet in the solar system, positioned between Venus and Mars in relation to the Sun. This optimal position allows Earth to maintain a balance of temperatures suitable for life, as it is located within the "Goldilocks Zone" where conditions are just right for liquid water to exist. The Earth's orbit around the Sun takes approximately 365.25 days, resulting in our calendar year. This unique position, along with its atmosphere and magnetic field, plays a critical role in making Earth the only known planet to support diverse life forms.