Electromagnetic Waves:

Consider about the electromagnetic (EM) fields produced by wireless broad-casting. In the journal of cosmic olden times, such waves have existed in our corner of the universe for only a small while. Our galaxy is very old, though television programs have been airing for less than 2 x 10^-8 of its life.

Television waves do not occur directly out of nature. They are generated by particular equipment invented by a specific species of living thing on the third planet in orbit about a medium-small star. Perhaps these waves are produced by other species that live on other planets in orbit around the other stars. When so, we have not heard any of their signals so far.