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| rdfs:comment | - Class J planets range in age from 2 to 10 billion years old. Their diameters range in size from 50,000 to 140,000 km. They are mostly located in the cold zone region of a star's solar system, although some have been found to exist in hot regions. Their surfaces are tenuous, comprised of gaseous hydrogen and hydrogen compounds. The atmosphere within the planet vary in temperature, pressure and composition. Hydrocarbon-based life has been known to exist in these planets. (Star Trek: Star Charts)
- In 2372, the USS Defiant entered the atmosphere of a class J planet to rescue the crew of a Karemma ship. The Karemma were attempting to escape from two Jem'Hadar ships. The atmosphere had windspeeds of over 10,000 kilometers per hour. This planet also had fluorine gas in its atmosphere. (DS9: "Starship Down")
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| abstract | - Class J planets range in age from 2 to 10 billion years old. Their diameters range in size from 50,000 to 140,000 km. They are mostly located in the cold zone region of a star's solar system, although some have been found to exist in hot regions. Their surfaces are tenuous, comprised of gaseous hydrogen and hydrogen compounds. The atmosphere within the planet vary in temperature, pressure and composition. Hydrocarbon-based life has been known to exist in these planets. (Star Trek: Star Charts)
- In 2372, the USS Defiant entered the atmosphere of a class J planet to rescue the crew of a Karemma ship. The Karemma were attempting to escape from two Jem'Hadar ships. The atmosphere had windspeeds of over 10,000 kilometers per hour. This planet also had fluorine gas in its atmosphere. (DS9: "Starship Down") According to Geoffrey Mandel's Star Trek: Star Charts, gas giants have an age ranging from two to ten billion years and a diameter between 50,000 and 140,000 kilometers. They are located within the "cold zone" of a star system. A class J planet is characterized by a tenuous surface, consisting of gaseous hydrogen and some hydrogen compounds, and an atmosphere consisting of zones that vary in temperature and composition. The only known lifeforms to be found on J-class planets are hydrocarbon-based. Examples of class J planets include Jupiter and Saturn.
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