(military) The areas between a weapon and its target in which the trajectory is not greater than the typical height of a human (about 1.8 meters)

(mathematics) The vector space generated by all the column vectors of a matrix

Alternative letter-case form of space age

(mathematics) The path traced by the instantaneous centre of a rotating three-dimensional body moving relative to an inertial frame of reference

The region of space containing objects that an optical system can form images of.

(physics) The localized excess electric charge in a specific volume; especially such a negative charge

(biology) Any of various biological sciences that deal with living things in a space environment

The loss of energy of a signal (due to absorption, dispersion etc) as it travels through a medium; measured in decibels

The environment encountered by living creatures (and vehicles) in space; especially a lack of atmosphere and gravity

A mental representation of a particular problem, including initial, final and possible intermediate states