SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Soviet satellite monitoring. Telescopes being used, in 1958, by Soviet astronomers, to monitor a satellite as it passes overhead. These astronomers are research associates of the Pulkovo Observatory, near St Petersburg, Russia. The world's first satellite, Sputnik 1, was launched on 4th October 1957. By the time these observations took place in October 1958, there were three satellites in orbit: Sputnik 3, Explorer 1, and Explorer 4. The last two were part of the US program of Explorer satellites.
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