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Published online by Cambridge University Press: 18 July 2016
A point source of cosmic rays at δ = 0°, α = 5h 30m, was reported at the Mexico Meeting of IUPAP in September 1955 (Nature, Lond.177, 35, 1956). The existence of the point source was verified by further observation. This phenomenon suggests the possibility of a direct method of exploring interplanetary space.