ballonhoogaltitudeobservatoria
I couldn't find any information on "Ballonhoog altitudeobservatoria". It's possible that this is a fictional or obscure term, or it may be a misspelling or misnomer for a different concept.
However, I did find information on something similar called "Stratospheric Observatory for Infrared Astronomy" (SOFIA) which
SOFIA is a collaboration between NASA and the German Aerospace Center (DLR) and has been operational since
Other observatories that work at high altitudes include the Mauna Kea Observatory in Hawaii, which is set
It's also possible that "Ballonhoog altitudeobservatoria" refers to a Dutch or international project to build an