I am curious, I never found any data about what is the highest spot on Mercury (on the area where it was scanned by Mariner 10 and MESSENGER) or the moons of big planets, minor planets... etc., just Earth, Mars and Venus.
And what is the steepest and deepest valley/canyon/etc. in the Solar System and on planets themselves?

thx in advance for answers

My guess is Olympus Mons (?) and that big,long canyon on Mars. But what do I know? Mr Q

Thx but I was asking for MERCURY and another bodies not solar system as a whole.

I'm also a bit confused by the wording of your question:

... what planet(s) or moons are you asking about then?

There is a great book by Paul Hodge called Higher than Everest: an adventurer's guide to the solar system.

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Martin ( http://www.geocities.com/DrMartinV )

There's not great information about altitudes on Mercury since there's never been an orbiter. This site says the rim of the Caloris basin is up to 3 km high and contains the highest mountains on Mercury.

However, MESSENGER has a laser altimeter that should provide lots of good information once that mission goes into orbit. Unfortunately, that's not for a few years yet.

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In Miranda there are steep surface features, from what I remember, but I haven't been able to find any figures...
I suggest you browse through the Nine Eight Planets website.

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