Unit used to express flux. 1 Jansky = 10-26 W m-2 Hz-1 Bandwith.

Japan Aerospace Exploration Agency. (Formed in 2003 by merger of ISAS, NAL and NASDA.)

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.

Any of the four biggest planets: Jupiter, Saturn, Uranus, and Neptune.

Jet Propulsion Laboratory (Pasadena, California).

Johnson Space Center (Houston, Texas).

Fifth planet from the Sun, a gas giant or Jovian planet.