The hyperspace travel in the Star Wars franchise requires two elements, Light speed travel and Hyperspace. Ships in the Star Wars Universe have engines capable of propelling them to the speed of light. But in real physics it is impossible for any physical object to attain that speed. To do so would require infinite energy, which is also impossible to generate in our universe. Even traveling at the speed of light would still take thousands of years to travel the galaxy, so the Star Wars ships use a hyper drive.
This is explained by having the ships warp to another "dimension", presumably a "brain" universe with different physical laws. Gravity reaches between hyper and real space making this unlikely. Hyperspace in Star Wars is unrelated to the presumed space between universal "bubbles" in real life physics.