Thread:NoWayThisUsernameIsAlreadyOwnedBySomeone/@comment-25046890-20160124073754/@comment-10228869-20160124093833

Even if you tap the character to send them on a job, they go to the places as above; you can't choose. Note that the order of preference is the reverse of the build order, so unless you store something, they will always do the job at the last one built.

Teach Astrophysics may be available at the Launch Pad if you don't have the Observatory, but it might not unlock without Nightfall?, which you can't do without it. (I do, so I can't tell.)

Doing it like Wiggum's Nap sounds best.