A manifold or topological space X on which G acts by symmetry in a transitive way.

Alternative spelling of spaceship

(idiomatic) An indication that a development will follow.

plural of space probe

plural of space alien

(chiefly US) An extraterrestrial being; a visitor from outer space.

plural of space defense

(mathematics) A topological space that is the quotient of a free action (of the specified group) on a weakly contractible space.

(mathematics) A map from a topological space onto another by local homeomorphisms of disjoint preimages. / (mathematics, informal) The space so mapped.

A hostile alien from outer space.