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Attackpoint - performance and training tools for orienteering athletes

Discussion: That sucks

in: Xena; Xena > 2016-02-04

Feb 5, 2016 5:44 AM # 
See what I did there? :)

The graphite-epoxy truss that supports the secondary mirror on HST has been outgassing moisture ever since launch, and the resulting shrinkage has prompted over 20 secondary mirror moves to keep the telescope in focus. After 25 years the trend has finally flattened. It shrank a whopping 0.15mm!
Feb 5, 2016 12:47 PM # 
you can not spend so much time under vacuum, you will shrink, save yourself !!!

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