Earth is the third planet from the Sun and is unique in the solar system due to its ability to support life. It has the right conditions, such as a suitable atmosphere, liquid water, and a stable climate, which have allowed diverse ecosystems to thrive. Earth's position in the 'Goldilocks Zone'—not too hot and not too cold—ensures that temperatures are conducive to life. Additionally, Earth’s magnetic field protects it from harmful solar radiation, making it a haven for various forms of life. The study of Earth helps us understand not only our own planet but also the potential for life on other celestial bodies.