chasma
Noun
Meaning
(astronomy, geology) A long, narrow, steep-sided depression on a planet (often other than Earth), a moon, or another body in the Solar System.
(astronomy, obsolete, rare) An aurora.
Obsolete form of chasm.
Source: en.wiktionary.orgSynonyms
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Subsequent freezing of the ocean after the moons escaped from the resonance may have generated the extensional stresses that created the enormous graben system of Ithaca Chasma on Tethys.
Three times deeper than the Hebes Chasma on Mars, twice as deep as the Herschel crater on Mimas, deeper even than the ice rifts of Tethys.
The colony itself was set in the Melas Chasma, the deepest and widest part of the valley—eleven kilometers below the surrounding plains, which meant it had the highest natural atmospheric pressure.