Here are entered works on the physics and technical details of locomotion beyond the earth's atmosphere. General works on the scientific, technological, and engineering disciplines needed for the exploration of outer space are entered under Astronautics. General and technical works on manned space travel are entered under Manned space flight. Works giving accounts of events and experiences during specific manned space flights are entered under Space flights. General works on travel to the planets or to the stars are entered under Interplanetary voyages or Interstellar travel.