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Doomed fictional planet, 7 letters

Doomed planet of comics, 7 letters

Fission product, 7 letters

Gas in fluorescent lamps, 7 letters

Green planet of the comics, 7 letters

Inert gaseous element, 7 letters

Its atomic number is 36, 7 letters

Jor-El's planet, 7 letters

Kal-El's birthplace, 7 letters

Neon cousin, 7 letters

Superman's birthplace, 7 letters

Superman's home, 7 letters

A colorless element that is one of the six inert gasses, 7 letters

Occurs in trace amounts in air, 7 letters

The length of a meter is based precisely on the amount of light emitted from this, 14 letters

Element in comic books since 1949, 10 letters

Fictional substance in Superman, 10 letters

Superhero's undoing, 10 letters

Superman's bane, 10 letters

Superman's weakness, 10 letters

Horoscope Writer, 11 letters

A genus of fish in the family Anomalopidae, 16 letters


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