this post was submitted on 22 Oct 2025
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[–] MajorasTerribleFate@lemmy.zip 6 points 3 days ago (1 children)

Uranus's moon Miranda has features called coronae, at least one of which has a depth probably exceeding the Challenger Deep low point of the Mariana Trench - estimated at 10 to 20 kilometers, vs. Challenger Deep's 10.4 kilometers.

Alternatively, the Kola Superdeep Borehole SG-3 has a depth of over 12.2 kilometers, also deeper than Challenger Deep.

[–] peoplebeproblems@midwest.social 3 points 3 days ago (1 children)

That's... Pretty deep.

But I think we also need total volume.

[–] MajorasTerribleFate@lemmy.zip 3 points 3 days ago

Wikipedia, re: Valles Marineris on Mars:

At more than 4,000 km (2,500 mi) long, 200 km (120 mi) wide and up to 7 km (23,000 ft) deep, Valles Marineris is the largest canyon in the Solar System.