Passive cooling.
Apparently the CHEOPS CCD is passively cooled.
If they have made it actively cooled they could have included a refrigerator, the door of which is the natural habitat of such pictures!
No less than 3,000 sketches by European kids will accompany the CHEOPS space telecope when it thunders aloft in early 2018 on its mission to accurately measure the radii of transitioning exoplanets. Back in 2015, youngsters between the ages of eight and 14 were invited to submit black-and-white artwork for possible engraving …
I particularly like these british entries:
Paisley planets
http://cheops.unibe.ch/wp-content/uploads/childrendrawing/winner/GBR/GBR-059_OL1-2RH.jpg
Earth with sea monster
http://cheops.unibe.ch/wp-content/uploads/childrendrawing/winner/GBR/GBR-029_CV31-2LE.jpg
Aliens galore
http://cheops.unibe.ch/wp-content/uploads/childrendrawing/winner/GBR/GBR-052_OL2-6DE.jpg
taking the dog for a walk
http://cheops.unibe.ch/wp-content/uploads/childrendrawing/winner/GBR/GBR-058_OL9-0NU.jpg
Space animals!?
http://cheops.unibe.ch/wp-content/uploads/childrendrawing/winner/GBR/GBR-011_OL9-0PL.jpg
TV robot lowered by sky-crane
http://cheops.unibe.ch/wp-content/uploads/childrendrawing/winner/GBR/GBR-004_B14-7EG.jpg
Aside from the obvious "Why not?", I see it as a cheap way to defray costs. I can think of all sorts of reasons people might pay money to see something of theirs go up in space for a few million years.
Doodles, sonnets, locks of hair. Belly button lint!
Also it's nice to let the kiddies express themselves so energetically. :-)