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In the mid 1950's he wrote several papers on artificial satellites so that when Sputnik 1 was launched in October 1957 he was already considered a world authority and was nominally in charge of the RAE prediction Service.
In the last 50 years, human beings have launched thousands of artificial satellites into space.
Quite apart from artificial satellites there were other things too.
KEYHOLE, CORONA, ICBMs, and artificial satellites, were looming on the horizon; and electronic intelligence (ELINT) was becoming the "preferred information of choice.
Topics included radio astronomy and artificial satellites
Since their useful life is long, solar cells are also used as the energy source for communications with artificial satellites and in unmanned lighthouses.
When the first artificial satellites were sent into orbit around the earth in 1957, some way of tracking them was called for.