Krypton
Krypton is an element, number 36 on the periodic table.

In 2267, the  crash landed on Taurus II, near Murasaki 312. The crew found the atmosphere breathable, an oxygen-nitrogen mixture, with traces of krypton, neon, and argon, not dissimilar to that of Earth. ()

Later that year, the Galileo II was forced to crash-land on a planetoid in the Gamma Canaris region. The crew found the atmosphere to also be an oxygen-nitrogen compound similar to that of Earth, again containing trace amounts of krypton, argon, and neon. ()

See also
 Kryptonite

External link
 

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Elements