one of a series of Soviet space probes that photographed the moon and returned to earth.
any of a series of unmanned Soviet spacecraft, first launched in 1964 as interplanetary space probes, the most successful of which, Zond 3, sent back photographs of the hidden side of the moon in 1965
- Zone of accumulation
. zone of accumulation See B horizon.
any continuous tract or area that differs in some respect, or is distinguished for some purpose, from adjoining tracts or areas, or within which certain distinctive circumstances exist or are established. Geography. any of five great divisions of the earth’s surface, bounded by lines parallel to the equator and named according to the prevailing temperature. […]
- Zone of avoidance
the area of the sky in the plane of the Milky Way where interstellar dust obscures visible light so that no distant galaxies can be observed.
- Zone defense
a method of defense, especially in basketball and football, in which each member of the defensive team guards a specified portion of the playing area.