This seemed likely to be a fun thread for the space/astronomy enthusiasts among us (probably more than a couple!)
Over the years, I've accumulated ridiculous numbers of photos and other imagery from Hubble, etc., much of it well-circulated, such as the Hubble "Deep Field" work. So I'll begin, instead, with some less-well-known imagery from the
Cassini mission to Saturn.
These are both images of the
Saturn's moon Mimas (yes, yes, ... the one that looks like the Death Star--and don't forget, Saturn also has a moon named Pandora!). Something about these images just gives me chills!

The backdrop of Saturn in both is just such a great illustration of cosmic scale, albeit
small cosmic scale.
(I did
not crop these; alas that most of the Cassini imagery isn't quite desktop resolution!)