„As soon as we started looking at them, we saw the most remarkable situation. My first thought was, "Great guns! Something's gone wrong with the apparatus!" But then we got later North American tapes and everything seemed normal again.“
— James Van Allen
On the first results from Explorer I, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.