Glossary – J

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Jet: a thin, highly focused beam of matter and energy emitted from the cores of some active galaxies. Jets can be hundreds of thousands of light years long.
Joule (J): a unit of energy, equal to 6.3 x 10¹⁸ eV.
Jovian: Jupiter-like planets that do not have solid surfaces, as they are composed primarily of helium and hydrogen. They typically have radii larger than 10,000 km (6,213.7 miles) with a mass over 1 x 10²⁵ kg. Gaseous planets also have rings and many moons.

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