![]() 1A), and at only the second attempt I found what looked like a star map – in which it appeared that the probe had come from the double star Epsilon Boötis, in the constellation Boötes, the Herdsman (Fig. I tried plotting the delay times against the order in which the echoes were received (Fig. Bracewell himself had suggested the first signal from such a probe might be a star map, and the stars are spaced at random in the sky. The variations of delay times appeared random but Prof. Ron Bracewell of Stanford suggested in 1960 that the ‘echoes’ might have been rebroadcast by an unmanned probe from another civilisation, trying to attract our attention, and in 1972 I worked out a ‘translation’ of the 1920’s echo patterns. In later experiments the delay times began to vary upwards from three seconds, in increasingly complicated sequences, but with no variation in intensity – still indicating a single source amplifying and returning the pulses. ![]() Experimenters studying round-the-world propagation of radio waves found their outgoing pulses were being returned to them with a delay of three seconds, as if they were being amplified and returned by something at the distance of the Moon – but definitely not the Moon itself. In April 1973 the British Interplanetary Society published my article ‘Space Probe from Epsilon Boötis?’, 1 which was based on the mystery of long-delayed radio ‘echoes’ (LDE’s), first reported in the 1920’s.Īctually, the ‘echoes’ were much too powerful to be simple reflections of signals from Earth.
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