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Re:Show HN: MapHub – A Google My Maps Alternative, Based on ... by JorgeGT on Wednesday March 30, 2016 @04:41PM (#11392820)
Note the "generally" there. Further down it says explicitly "NASA material is not protected by copyright unless noted". In their Flickr page they have selected the CC BY-NC 2.0 license so this works, I think, as a notice of copyright that at the same time grants you a license to use the image (provided you follow the terms of said license).
Re:Show HN: MapHub – A Google My Maps Alternative, Based on ... by maxerickson on Thursday March 31, 2016 @10:23AM (#11397356)
If it is a work of NASA itself, it shouldn't be subject to copyright. Wikimedia has noticed their assertions:

https://meta.wikimedia.org/wiki/Wikilegal/NASA_images

It's easy to imagine that NASA has more limited rights to reproduce and redistribute images produced by their partners though, and they have lots of partners.