The source of the sun's energy, as well as that of every star, is nuclear fusion
in its core. The only way we're able to use nuclear fusion consistently on Earth
so far is in the explosions of large nuclear weapons, but we're working on the
ability to control other applications.
Among other things - your existence.
The Sun's energy is given out mainly as "electromagnetic radiation". Light is a form of electromagnetic radiation. Heat is the main form the Sun's energy has when it reaches Earth, particularly the Earth's surface.
No never as mechanical energy. It reaches mainly as light and heat
The light travel directly through the vacuum and reaches earth
Heat!!!!!! While the sun does produce a lot of heat, none of it reaches Earth. What reaches Earth is electromagnetic energy (light). Some of this light is converted to heat here on Earth, such as some of the light that hits your skin.
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Waves of heat and light, called radiation, travel to earth.
Energy from the Sun reaches Earth as radiation from various parts of the electromagnetic spectrum. Some of this energy . Some of this energy is converted to heat. Some remains as visible light.
Solar energy reaches the earth by two means, Electricity and Gravity.
heat is the cause in the increase in thermal energy. the sun also causes it one the earth, because the heat from the sun projects light in a beam onto the earth and heats up the earth.
Solar energy is practically light. Light travels through waves. But yes, solar energy is light. It brings heat to the earth, which is solar energy.