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Olympus Mons, the highest mountian in the solar system is measured at 27km. It's on Mars which doesn't have a sea level, so what do they use as a reference for this measuerment?
This is a great question...I don't suppose they can impose a false sea level so in this case I would imagine that just take the exact measurement from the base.....or...as I suspect the average height of the surface !...but what do I know...I'm just a sheep !!
I think there may only be eight planets in the solar system now, we lost one a while ago.
Oh, that's interesting - have you got a reference for the "definition" of a planet these days please infradead?Chris
Thanks, that's really useful - you've taught me something tonight!Chris