Solar+Energy


 * Solar Energy**, is an alternative and renewable energy. It is an energy that is radiant heat and light from the sun, it has long been used by humans in a range of special technologies, Solar Powered electricity is generated by heat engines and photovoltaics the only reason Solar Energy isn't used as a main energy source for humans is because it has not been improved enough to cover the vast electric expenses made by man-kind. If it were improved it would be an ideal solution because unlike other faster ways to create electricity it does not polute or cause harm to the planet in any way.

There are 2 ways to create electricity using solar energy. The most common way is **photovoltaic cells**, also known as solar cells: certain electromagnetic waves, usually sun light and close frequency waves, hit the cell and causes a chemical process that produce electric current.

The second way is the **solar power tower** - also known as solar thermal power plant. In the power plant there is large circle of mirrors, which directs the sunlight to the head of a tower, located at the center of the circle. The heat is concentrated at the top of the tower, and boiling water that turn into steam and power a turbine.

Scientists also have plans for the future of the solar energy. They believe that one of the reasons of the global warming is the increasing radiation waves from the sun, so they have thought about an idea for the "Dark day of earth" when Earth will be much warmer. An idea of creating huge number of satellites that will stand in the way of the radiation from the sun and will cool the Earth. They understand that if they already have satellites in space facing the sun all the time, they can put on them ** photovoltaic cells that will use the power of the radiation and send it to Earth. **
 * That way they will lessen the pollution and cool Earth even more. **

The solar energy is even used in our homes. Our boilers have a special thing that can "catch" the light and hit energy and makes our water hotter. That could only be worked on homes which have that special boiler.



=> In this picture you can see a solar tree in Austria.

These days, there are a lot of companies and humans in Israel that buying ** photovoltaic cells ** for making green, alternative and cheaper energy. For example: a year ago the company "Paz Solar" signed a contract with the settlement "Sde Boker" for building two solar power stations that will feed the settlement with energy. There are some other settlements in Israel that are fed mostly by solar energy and much more plans for using solar energy and creating solar power stations. Today, solar energy is becoming very popular in many states. For example: in south Germany there are houses and farms that having huge solar farms, people that having those farms are usually not just completely feeding their houses with energy, but having reserves of energy and selling them to the electric companies nearby. There are a lot of many other ways and places around the world that using solar energy. These days, some scientists in NASA are working about some green planes that using solar energy. They have ** photovoltaic cells ** on their wings that supply them an energy to fly. There are a lot of things they need to work on so most of the people haven't heard about it yet, but once this project will be finished it will change the world.
 * Solar energy in Israel**
 * Solar energy in the world**

[] media type="youtube" key="5oNHD41MLMk" height="385" width="480" Facts on the link ab ove.
 * A plane flying using solar energy - YouTube video**