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Nuclear fusion of elements lighter than iron powers all stars. Basically, when two elements fuse together, there is a loss of mass in the "binding" that holds the nuclei together. In accordance with the law of preservation of matter (it cannot be created or destroyed), that must go somewhere. It is essentially "carried away" in the form of energy. It is this energy that is what keeps the sun, and all other stars, going strong.

In the sun, hydrogen is fusing to form helium.

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Is it a chemical reaction when the moon gives off light energy?

No. The moon does not even give off light energy. It reflects light from the sun. This is a purely physical process.


How is the chemical energy in fossil fuels related to the sun's energy?

Fossil fuels are formed from organic matter that originally obtained its energy from the sun through photosynthesis. This organic matter stored the sun's energy in the form of chemical bonds, which is released as chemical energy when the fossil fuels are burned. So, the chemical energy in fossil fuels can be traced back to the sun's energy.


What forms of energy does the sun have?

Primarily, the sun radiates energy in the form of light. Light waves, or photons, carry the energy away uniformly in all directions. The sun also transfers a miniscule proportion of its energy in other ways. It emits streams and bursts of kinetic energy and electric potential energy when it ejects high speed charged particles into space, commonly called the solar wind and solar flares. The sun also transfers kinetic and thermal energy to its orbiting planets through gravitationally induced tidal friction. Some suns explode following the depletion of all their fuel, resulting in a single, cataclysmic kinetic energy release. In this explosion, the sun releases potential atomic energy captured in the byproducts of a solar lifetime of nuclear fusion. These byproducts, known to us as the elements of the periodic table (such as carbon, nitrogen, and oxygen) make up the stuff of other suns, planets, and their inhabitants.


What two types of energy does the sun produce?

The sun primarily produces two types of energy: electromagnetic radiation, in the form of sunlight, and nuclear energy, through the process of nuclear fusion in its core. The nuclear fusion reactions within the sun's core convert hydrogen into helium, releasing vast amounts of energy in the form of heat and light. This energy is essential for sustaining life on Earth and driving various atmospheric and oceanic processes.


What is the energy that comes from the sun?

The energy that comes from the sun is called solar energy. It is produced by nuclear fusion reactions within the sun's core, which generate light and heat that radiates out into space. Solar energy can be harnessed and converted into electricity using solar panels.