The primary source of energy for the Earth is the Sun. Solar energy drives multiple processes on our planet, including photosynthesis in plants, which forms the basis of the food chain and oxygen production. The Sun’s energy also influences weather patterns, ocean currents, and the climate, impacting ecosystems and human activities. Solar energy is harnessed through various technologies, such as solar panels and thermal collectors, to provide electricity and heat. Additionally, the Sun's energy is crucial in maintaining the Earth's temperature and supporting life, emphasizing its vital role in sustaining our planet's systems.