Rethen was a type of gas that was found within the atmosphere of the gas giant planets of Kiilaniri and Bespin.

Bespin was composed of rethen in liquid and solid forms.

SourcesEdit

• Planets of the Galaxy, Volume One
•  Galaxy Guide 2: Yavin and Bespin, Second Edition
• The Official Star Wars Fact File 5 (BES3, Bespin)
• Alien Anthology
•  Space beldon on Wizards.com (original article link, backup links 1 2 on Archive.org)