What is the ultimate source of energy?

The ultimate source of energy is the Sun. It is a massive ball of hot gases, mainly hydrogen and helium, at the center of our solar system. The Sun's energy is produced through a process called nuclear fusion, which converts hydrogen into helium. This process releases massive amounts of energy in the form of heat and light, which is then emitted into space. Solar energy is the primary source of energy for life on Earth. It drives the weather patterns, provides warmth and light, and allows plants to grow through photosynthesis. Other sources of energy, such as fossil fuels and nuclear power, ultimately derive their energy from the Sun, as they are formed from ancient plants and animals that relied on solar energy for their growth. In short, the Sun is the ultimate source of energy for all life on Earth.