1. About 30% of the radiation that we receive from the sun at the upper atmosphere is reflected back into space. The rest of 70% is absorbed by clouds, oceans and land masses here on Earth. Even in these conditions, the energy that our planet gets from one hour of sun exposure is equal to the amount of power that humans use in an entire year! Just imagine if we had the means…
2. Even if the ancient Greeks believed that the sun was truly the god Helios, driving his chariot around the Earth towards the sky in the morning and in the evening back again, they still built houses so that they would get enough heat from the sun during winter. So did the Chinese.
3. Photovoltaics (PV) is the field of technology and research related to the application of solar cells for energy by converting sunlight directly into electicity. This is the official definition of Photovoltaics given by Wikipedia. In simpler terms, solar energy can transform into electricity and this process with all its implications is studied by Photovoltaics.
4. Silicon is a chemical element found in sand whose semiconductor proprieties were discovered In 1954 by Bell Telephone Company. Right now silicon is the main element used in producing solar cells for solar panels. To put this at a larger scale, silicon from one ton of sand, used in photovoltaic cells, could produce as much electricity as burning 500,000 tons of coal.
5. Solar water disinfection can be achieved by exposing water bottles to the sun for a certain period of time (6 hours if the water is exposed to a bright sun or more, depending on the state of the weather). This way the quality if drinking water is improved due to UV-A radiation and sun temperature.
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