If sun is the source of energy on earth, then this means that the sun is providing new energy everyday. Then how does this phrase does make any sense: "Energy is never created nor destroyed, only transformed"? Because if all the functions of earth is going on by a fixed energy, only transforming one into another, then what about the new energy coming everyday from the sun?


marked as duplicate by sammy gerbil, ZeroTheHero, John Rennie energy Jun 11 '17 at 4:59

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    $\begingroup$ The sun loses energy by the second, however It's not creating new energy, The star will, in the far future lose it's energy and become a white dwaf. $\endgroup$ – Douglas D. Beatenhead Jun 10 '17 at 17:59
  • $\begingroup$ question is about Earth @DouglasD.Beatenhead and ok i understand sun but, from where the first energy came? $\endgroup$ – M Ashraful A Jun 10 '17 at 22:34

Within the star (our sun) fusion reactions take place in it's core to generate radiation. To go into this properly you need to know about nuclear fusion but basically the binding energy released when helium is produced in the sun is transformed (mostly) to photon energy (radiation).

It is the energy of this radiation that the earth is receiving.

There is much more to it than this and I don't want to give an over complicated answer.


@PM 2Ring has given you a good explanation of where the energy goes in the comment below. I will just expand a little on a point made in that comment since you are asking 'where does the energy go after leaving earth?'

Basically, this process of 'absorption and re-emission' of the radiation (described in the comment) will continue with other bodies in space after the radiation has left the earth.

So you may be wondering at this point; Where does the energy all go in the end? I don't have a good answer to this and I don't know if such an answer even exists.

However, I can tell you that most energy is transformed to heat (energy) eventually.

  • $\begingroup$ Question is about Earth. new energy coming everyday from sun. so who earth giving to? $\endgroup$ – M Ashraful A Jun 10 '17 at 22:36
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    $\begingroup$ @MAshrafulA Some of the sunlight reaching Earth is immediately reflected back to space. Some of the Sun's energy is temporarily stored on Earth, eg in the form of heat, wind, chemical energy (both inorganic and in living things). The Earth radiates a lot of energy into space as infrared radiation. Most of that energy is from the sunlight, but some is from the breakdown of radioactive elements within the Earth (principally uranium & thorium). And some of that lost heat is a remnant of the heat of the Earth's formation. $\endgroup$ – PM 2Ring Jun 11 '17 at 0:49

The energy the sun provides us is down to total energy that is stored within the matter that it is made up of. The energy transferred in the transition between it and the earth and everything around it will eventually run out but it transforms this energy to other forms on the earth and around the universe so it is not lost but transformed to other energies potential, stored and kinetic forms etc and not lost a question I do not know the answer to is how do physicist attempt to calculate the total energy of the universe and what is the distribution and fate of this absolute as the universe undergoes the passage of time. Which I guess maybe the root of your question.


Then how does this phrase does make any sense: "Energy is never created nor destroyed, only transformed"?

Within the sun's core, energy is released (transformed) via nuclear fusion.

There is no energy creation; the sun loses roughly 4.2 billion kilograms of mass each second via this energy transformation.


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