Realspace

Realspace, also called normal space, space-normal to the Chiss, star-space to the Kilji species, or simply space, was the dimension in which all of the galaxy's residents lived. The vast majority of space was a vacuum, a depressurized volume devoid of atmosphere. The vacuum of space was fatal to many living organisms without the use of some sort of EVA suit and was unable to sustain fire. Because travel using sublight engines within realspace was slow, sentients found a technological way to access the shadow dimension known as hyperspace. A starship equipped with a hyperdrive would "jump" from realspace into hyperspace, and "revert" from hyperspace to realspace.

Species that could survive in the vacuum of space include exogorths and Cylo's cyborg whale-ships. Neebrays could survive in nebulae, such as the Kaliida Nebula. As well as being able to survive in space, the purrgil were capable of traveling through hyperspace.

Many droids were able to operate in space. Astromech droids were exposed to the vacuum of space when conducting repairs outside the hull of a starship and when inserted into the astromech socket of a starfighter. KX-series security droids could also survive in the vacuum of space. Battle droids, used by the Confederacy of Independent Systems during the Clone Wars, occasionally sat on the outside of ships, such as pod-hunting shuttles.

Text and facts from the “Realspace” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.