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The term nano robot refers to robots whose components are close to the scale of a nanometer (10-9 meters). Imagine a tiny sensor intended to detect cancer, or to perform nano surgery. Currently in research and development these robots have already been used to deliver drugs to the correct part of the body in terminal cancer patients.
Image: Nanotech Now
Satellite communications allow TV, radio, data and telephone transmissions to be sent anywhere in the world. Satellites are in orbit around the world, either moving or geo-stationary relative to the earth. They are powered by solar cells and batteries. They relay transmissions from one ground station to another via the network of satellites.
Image: ecat Report
Solar cells convert light energy to electricity. The photovoltaic effect was first demonstrated by Becquerel in 1839. It has recently achieved a level of almost 45 percent efficiency. A 5x5 ft solar cell could be screwed to the side of your house and meet all of your energy needs.