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Channel: Why do the LAGEOS' satellites have four germanium corner cube reflectors out of over 400? - Space Exploration Stack Exchange
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Answer by Bob Jacobsen for Why do the LAGEOS' satellites have four germanium...

D.A. Arnold "Optical and Infrared Transfer Function of the Lageos Retroreflector Array", 1978, NGR 09-015-002 (P179) confirms that they're for infrared measurements, and adds some interesting info:The...

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Why do the LAGEOS' satellites have four germanium corner cube reflectors out...

When I was writing this answer about the LAGEOS satellites, I noticed that only four of the over four hundred corner reflectors are made of optical germanium rather than fused silica. Fused silica (FS)...

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