Earth Absorbs 4.4lbs Of Sunlight Each Second!?
Okay, now I have another question, please. 
~
I heard that every second the earth is struck by two kilograms of sunlight. that would be 4.4 pounds of sunlight each second all around the world. now I know that some of that sun energy might bounce back out into space, but as for the rest of it–well, it just gets absorbed by the various parts of the earth, right? so each second, the earth is gaining 4.4 pounds of energy?
if so, then what was earth’s weight, say, a hundred years ago compared to today?
does anyone have a scale large enough so that I can find out? LOL
5 Responses to “Earth Absorbs 4.4lbs Of Sunlight Each Second!?”
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Photons are actually massless – light weighs nothing. However as Einstein first pointed out energy is equivalent to mass according to the formula
E=mc^2
where c is the speed of light – 300 million meters per second
rearranging the equation
m=E/c^2
According to the link below earth receives 174 Petajoules per second from the sun.
Therefore
m= 174 *10^15/300 *10^6/300*10^6
m=1.95 kilograms
Looks to me that your source is correct.
However the same energy is radiated back into space (earth is not getting appreciably warmer except for a little global warming)
Hence the net effect is zero.
Light, which is transmitted as photons, have no mass. They don’t weight anything. We are gaining energy/power from the light from the Sun, not mass. Part of that energy is used to warm the Earth. Part of that energy is used by plants for photosynthesis. Most of it is reflected back to outer space.
that light is being absorbed my us, plants, animals. So we are recieving that. plants use it for photosynthesis, we use it to create vitemin D. It is energy in incredibly small microfragments that the WHOLE earth is absorbing.
Think about when you stand in the sun. Do you feel warmer? What is making you feel that? It is the sun’s energy.
well there is 207,360,000 seconds in 100 years so 912,384,000 lbs of added weight. The mass of the earth is 13,227,735,731 so about 14% increase in weight
You probably could not distinguish it from the meteors that hit the Earth every day.