Are screenshots from GPLed software free?

Guillaume Ponce hacker at
Mon Jul 22 17:11:55 UTC 2013

Can screenshot from GPLed software be used freely in documents?

E.g. can images from Stellarium, a planetarium software under GPL v2, 
be used for public communication by an amateur astronomy association?

I think that it should be covered by the "can be used for any purpose", 
but not completly sure.

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