It is not often that images from US Keyhole spy satellites are published. These satellites have 2.4m mirrors (as large as that of the Hubble telescope), and are believed to produce the sharpest images of the Earth's surface. The actual resolution of the images is kept secret.
— Cees Bassa (@cgbassa) August 30, 2019
via Twitter https://twitter.com/cgbassa
August 31, 2019 at 05:06AM
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