When did humans figure out how high the atmosphere goes?

I am watching a movie from the 1930's, and the universal studios logo has the entire earth in front of clouds. I also remember seeing a looney-tons episode where a character was flung into the stratosphere, and again the earth isa small dot surrounded by clouds and blue sky. When did people realize the... show more I am watching a movie from the 1930's, and the universal studios logo has the entire earth in front of clouds. I also remember seeing a looney-tons episode where a character was flung into the stratosphere, and again the earth isa small dot surrounded by clouds and blue sky. When did people realize the atmosphere is only a thin blue line?
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