Glossary of Space Exploration Terminology

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V
Van Allen radiation belts
Two doughnut-shaped zones of radiation about the Earth, concentrated at altitudes of 3,000 and 10,000 miles; named after James A. Van Allen who instrumented the satellite Explorer I. The belts contain charged particles generated by solar flares and trapped by the Earth's magnetic field.
Vector
A quantity that is specified by magnitude, direction and sense.
Velocity trim
See orbit trim maneuver.
Velocity vector
Magnitude of speed plus direction.
Venus
Second planet from the Sun, a terrestrial planet.
Vernier
Rocket engine of small thrust used for fine adjustments in velocity and trajectory.
VfR
Verein fur Raumschiffahrt e. V. (Germany).
VHF
Very High Frequency.
Vidicon
An imaging device consisting of a vacuum tube, in which an electron beam is swept across a phosphor coating on the glass where the image is focused, and its electrical potential varies in proportion to the level of light it encounters. This varying potential becomes the basis of the video signal produced.
VLBI
Very Long Baseline Interferometer.
Volcanism
Volcanic force or activity.
Volcano
An opening in a planet's crust that allows magma to reach the surface.

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Rocketry & Space Technology

Glossary courtesy of Robert Braeunig's
Rocketry & Space Technology website.