This is probably the most boring post here, but the Hubble can use the moon as a mirror, since it can't look directly at the sun the Hubble uses the moon to find find out venus's atmospheric makeup, I find that pretty cool technology wise.
for more info: http://www.sciencedaily.com/releases/2012/05/120504135730.htm
Yeah well... I think it's pretty cool in a way how the moon can be used as a guide. It's an interesting random fact I guess.
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