Letter from Thomas Gold to Professor David R Bates, FRS, Editor-in-Chief, Planetary and Space Science, Department of Applied Mathematics, The Queen's University of Belfast, Belfast, N[orthern] Ireland Says that that the enclosed paper [not included with this letter] is worth publishing. The only comment he has is that the word, 'dust' should not be used as no one has any clear idea what the consistency of dust is. 20 July 1966