Hacker News

points by bajard 4 days ago | 0 comments

If you were standing on the "walls" of the canyon, it would look like terrain with a 10%–15% slope. You wouldn't even notice it's a canyon.

[–] sebzim4500 4 days ago

Isn't a 15% slope really noticeable? Like it doesn't look like a mountain peak but it would be obvious which way was up

[–] setr 4 days ago

Apparently grade limit on mountain public roads is 7%, and that is definitely felt.

[–] brnt 4 days ago

It's a bit steeper, much of the length of the canyon the incline is 35%-ish.

[–] bajard 3 days ago

Google Earth also has Mars. You can measure the length of the banks. It's roughly 30 km, and the maximum elevation change is 7–8 km. That's the maximum, not the average. It gives a slope between 10% and 15%.

But visually, it's even less, because Mars is smaller than earth, so its curvature matters.

[–] brnt 3 days ago

On Nasas map I get 10km over 25km.

[–] KurSix 4 days ago

That's wild to think about. You could be standing inside the largest canyon in the solar system and have absolutely no idea