Artist/Geographer keeps his eyes on satellites.

Up in our darkened sky, sinister objects lurk.
They are not the vehicles of some alien life form bent on destroying humankind, though many do look like props from a sci-fi film. Some are so large they could engulf three football fields.
For four decades, the United States has been filling the outer reaches of our atmosphere with 189 reconnaissance satellites. And for several years, artist-geographer Trevor Paglen has been keeping his eye on them.
Complete SF Chronicle article HERE.