Lunar Reconnassance Orbiter, taking shots of the moon just 50km off the surface, has been doing flybys of the Apollo 17 landing site, and has seen the actual US flag still there!
(Originally posted 2009-10-30.)
We can’t say it “waves” because of course there is no air to wave it. :P
H/T to BadAstronomer: http://blogs.discovermagazine.com/badastronomy/2012/07/31/and-the-flags-are-still-there/#.VCczBildUsA and http://blogs.discovermagazine.com/badastronomy/2011/09/06/lro-spots-apollo-landing-sites-in-high-res/#.VCcxHildUsA