M81 Galaxy Group, Neutral Hydrogen, and Interstellar Dust
M81 Galaxy Group, Neutral Hydrogen, and Interstellar Dust
Flight #4: Air Photos Images were taken at 2 minute intervals. The balloon was launched from a farm near Northwood, ND, and recovered by Gently, MN. The flight lasted two hours, but there was only enough film for the first 72 minutes. This flight carried two cameras, one pointing straight down and the other horizontally out the side. Each camera was loaded with a 36 exposure roll of 100 AS
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