The main source of energy in the solar system continues to be the Sun. It drives, for example, the hydrological cycles on Earth which we harness as hydroelectric power; its energy was captured in chemical bonds by green plants long ago we now burn as fossil fuel such as coal and oil; it creates significant quantities of wind which drives turbines; it directly drives solar powered systems, etc - about the only form of energy it does not directly drive is nuclear powered plants. (The Sun does, of course, also heat and light other planets than Earth.)
nuclear fusion occurring in the core of our sun is the primary source of it's energy in which hydrogen converted into helium in proton-proton chain reaction giving the main products - positron, neutrino, gamma ray photon and isotopes of hydrogen and helium.
Hydrogen
all nonrenewable fuels can be traced back to the sun as a primary energy source
The Sun.
the ultimate source of energy for all living organisms is the sun
Wind power is described as a renewable energy source because winds are produced by the suns thermal energy and this is never going to fail or need other sources of energy.
Carbohydrates
The primary source of the suns energy is nuclear fusion of hydrogen. Nuclear fusion occurs in the core of the Earth.
Nuclear fusion. Mainly, hydrogen-1 is converted to helium-4.
primary
Carbohydrates are the body's primary and immediate source of energy.
Carbohydrates are the body's primary and immediate source of energy.
Nuclear fusion of hydrogen into helium.
Hydrogen and Helium
The term clean source of energy refers to only primary energy sources as wind or solar energy. Electricity, by definition, is not a primary energy source. It is a secondary energy source that is could be produced by a clean energy source as wind or any renewable primary energy source or produced by fossil energy source as oil, natural gas, or coal.
Chemical energy
The Sun is the primary source of all energy on Earth.
It is fusion of hydrogen to form helium
Carbohydrates are the primary energy source for herbivores (cows, horses, etc.). Proteins are the primary energy source for carnivores (dogs, cats, etc.).