CP-2156 Life In The Universe

Figure 1. Estimated growth in time-averaged transmitted power since TV broadcasting began.

Figure 1. Estimated growth in time-averaged transmitted power since TV broadcasting began. The solid curve for the United States is reasonably accurate since starting dates for all stations are available, but it was still necessary to use a model for the growth of transmitter power and daily broadcast hours for each station. The dashed curve for the entire world is correct for 1975 and only estimated for earlier dates. The increasing number of stars bathed by the expanding power bubble (as of 1980) is indicated at the top.

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