Glossary of Space Exploration Terminology

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J
Jansky
Unit used to express flux. 1 Jansky = 10-26 W m-2 Hz-1 Bandwith.
JAXA
Japan Aerospace Exploration Agency. (Formed in 2003 by merger of ISAS, NAL and NASDA.)
Jet propulsion
Reaction propulsion in which the propulsion unit obtains oxygen from the air as distinguished from rocket propulsion in which the unit carries its own oxygen-producing material.
Jovian planet
Any of the four biggest planets: Jupiter, Saturn, Uranus, and Neptune.
JPL
Jet Propulsion Laboratory (Pasadena, California).
JSC
Johnson Space Center (Houston, Texas).
Jupiter
Fifth planet from the Sun, a gas giant or Jovian planet.

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Rocketry & Space Technology

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