The UK's largest mobile, inflatable planetarium has been stolen from the University of Hertfordshire.
The so-called Cosmodrome was being kept in a trailer by the observatory in Bayfordbury near Hertford.
It is used to teach schoolchildren about space and also appears at music festivals.
The university said it was "utterly heartbroken" and wanted the public to keep their eyes peeled for the inflatable.
The portable planetarium is roughly the size of a house and can fit 100 people inside.
It uses light, sound and tactile experiences to host shows, lectures, and audio-visual art.
