Wiktionary:Word of the day/October 15

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Word of the day for October 15
chasma n
  1. (astronomy, geology) A long, narrow, steep-sided depression on a planet (often other than Earth), a moon, or another body in the Solar System.
  2. (astronomy, obsolete, rare) An aurora.
  3. Obsolete form of chasm.
PointingHand.svg The Cassini–Huygens space probe was launched on this day 20 years ago in 1997 to study the planet Saturn. During its closest approach to the moon Tethys on 24 September 2005, it photographed the Ithaca Chasma, one of the longer valleys in the Solar System. The mission was brought to an end on 15 September 2017 by having the probe make a controlled descent into Saturn’s atmosphere.

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