(astronomy) The real or apparent motion of a star etc. through space.

(medicine) The branch of medicine that deals with the effects of space travel on human beings

simple past tense and past participle of space out

(informal) In a confused or oblivious mental state, for example as a result of drug-taking. / Positioned at regular intervals with a specified space between them.

(mathematics) A measurable space having a unit measure

(psychology) The awareness of the position, size, form, distance, and direction of an object, or of oneself

The utilization of low gravity and/or high vacuum to carry out various processes in space

(physics) The ratio of magnetic induction to magnetizing force in a vacuum

The reconnaissance of the surface of a planet from an orbiting spacecraft.

(astronomy) The reddening of the light from distant stars because of selective absorption and scattering by interstellar dust