Hyperspace
Hyperspace was a physics concept related to zero gravity environments.

A hyperspace physics test was on the Starfleet Academy entrance exam. ()

In 2364, Geordi La Forge attempted to tell a joke to Data, involving a person staggering as he walks up to a girl. The punchline of that joke was "just try that in hyperspace!" ()

See also 
Hyper-subspace

External link 
 

de:Hyperraum
Physics