dish and observatory should be separate ? osm.org/node/10687150977

Probably the telescope ? https://taginfo.openstreetmap.org/keys/telescope%3Atype, there's already an "observatory" :
osm.org/way/1148682566

"on 6 June 2018, Orbital ATK was absorbed and became Northrop Grumman Innovation Systems"
https://en.wikipedia.org/wiki/Orbital_ATK

https://taginfo.openstreetmap.org/tags/industrial=aerospace

"on 6 June 2018, the acquisition was completed, and Orbital ATK became Northrop Grumman Innovation Systems.As of 1 January 2020, the name was changed to Space Systems under a large restructuring and rebranding initiative. " https://en.wikipedia.org/wiki/Orbital_Sciences_Corporation

See https://www.northropgrumman.com/who-we-are/business-sectors/space-systems

most likely a osm.wiki/Tag:geological%3Dvolcanic_vent

Which type ? osm.org/node/6350491514, see osm.wiki/Tag:natural%3Dcrater

Alice-Salomon-Haus https://www.swp.de/lokales/reutlingen/studieren-in-reutlingen-neues-studierendenwohnheim_-so-sieht-das-alice-salomon-haus-von-innen-aus-69257395.html
building=dormitory osm.wiki/DE:Key:campus

(Umrisse unklar)

Most likely a sinkhole ? osm.org/node/358797513/history , see osm.wiki/Tag:natural%3Dcrater

deprecated tag osm.org/node/358802485/history, see osm.wiki/Tag%3Anatural%3Dcrater

Is this a tethered balloon at the edge of the station ? osm.org/node/7161118322 >>> osm.wiki/Tag:balloon:launch%3Dmonitoring