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Asked by anon-249610 on 16 Mar 2020.
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Nuru Noor answered on 16 Mar 2020:
The gravitational pull of the sun holds the earth in place and every organism in the world needs the sun to grow!
We can indirectly get energy from eating foods (like animals which had grass and plants as food – which grew in response to energy they got from sunlight) and more directly we can actually use the power of the sun to make energy – with solar power!
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M S answered on 16 Mar 2020:
So it has to do with vitamin D. Sunlight is needed to convert cholesterol in to vitamin D which is needed for good health!
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Ioana Grigoras answered on 16 Mar 2020: last edited 16 Mar 2020 11:53 pm
This is such a cool question! I looked it up and I feel like a learnt some things myself 😀
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The energy we get from the sun comes in the form of radiant light and heat. The total solar energy absorbed by Earth’s atmosphere, oceans and land masses is approximately 3,850,000 exajoules (EJ = 10^18 Joules) per year. Photosynthesis catches around 3000 EJ each year in biomass, which is energy that plants use to stay alive and grow.
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The problem is how can we harness all this energy and transform it into a type of energy that we can use. Solar thermal technologies can use solar energy to heat water or spaces. Photovoltaics or concentrated solar power systems transform solar energy into electricity. Solar chemical processes use solar energy to drive chemical reactions.
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In 2012, total energy consumption was approximately 559.8 EJ, a lot less than the energy we receive from the sun during a year. We only need to better develop the technology to transform solar energy into energy that we can use. -
Sophie Arthur answered on 20 Mar 2020:
I think the others have summed this up. Plants use sunlight to get their energy, then we may eat the plants or animals that eat the plants which passes the energy on. But also sunlight helps us to produce key vitamins and stuff too
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