Hints： Mars July coarse-grained

But in July 1965, reality intruded. Mariner four became the first probe to fly by Mars and photographe it. At last, the world would see what the land of the little green men really look like. "When Mariner four flew by Mars, it just took a few pictures with a very coarse-grained television camera. And what it showed was a surface that could've been the moon. Clearly there was no civilizations, no canals, probably not even trees and insects. It was really a bleak landscape that was being photographed there. It really gave the impression that Mars was dead, and has always been dead since its early history. And they really dashed the hopes of dreamers thinking that maybe there was life there.

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