Update vacuum.md

uasal · Aug 4, 2023 · a3333e1 · a3333e1
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@@ -30,7 +30,7 @@ functions of source and target temperature
 ## Test data for materials:
 
 
-NASA outgassing data: [outgassing.nasa.gov](outgassing.nasa.gov) (backup copy of table): https://gist.github.com/douglase/59f60f348acc1364048a78d0299af434
+NASA outgassing data: http://outgassing.nasa.gov (backup copy of table): https://gist.github.com/douglase/59f60f348acc1364048a78d0299af434
 
 ESA Materials database (not maintained): http://esmat.esa.int/