Bowling Green city spokeswoman Kim Lancaster says the hole opened up at around 5:40 a.m. CST Wednesday, setting off an alarm and a call to the fire department.
The hole is in part of the domed section of the museum, and that area will remain closed. That's an original part of the facility for which construction began in 1992 and was completed in 1994.
Lancaster says information is still being gathered about what exactly happened, but this appears to be the first incident of its kind at the property.
No injuries have been reported.