|MadSci Network: Astronomy|
On earth we use the sea level as a basic reference of the height of mountains. The height of the mountain on earth is calculated somehow based on the weight of the mountain producing something called a geoid(its called that in swedish at least). This has the effect that the calculated sealevel can be below the actual sealevel. But the real issue is... how can we know the height of the mountains on other planets? Olympus Mons on Mars i supposed to be much higher then Everest, measuring from what? there is no sea that we know of. You cant measure from the lowest point of the planet, since that would make everest close to 20000meters. So what is the reference point for extraterrestrial mountains?
Re: How ca we measure the height of mountains on other planets?
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