Video encyclopedia

23/05/1958 NASA contacts Explorer 1 for the last time

First U. S. satellite stopped to transmit data. It was launched after Russian satellites Sputnik 1 and 2 as a part of American participation in the International Geophysical Year. Explorer 1 was the first spacecraft to detect the Van Allen radiation belt. It remained in orbit until 1970 and has been followed by other probes in Explorer series.