What does zero elevation mean on the Mars map that Google recently published?
Is it sea level? (Somewhere, USA) A: Mars has no seas or oceans so the “mean sea level” that we use on Earth to define a zero elevation won’t work on Mars. Instead, at Mars’ equator, we have measured its mean radius with the Mars Orbiter Laser Altimeter (MOLA). It is 2100 miles (3396.2 km). This value is the “sea” level of Mars. Technical details. “Zero elevation (or ‘sea level’) on Mars is essentially the planet’s average elevation,” says Carol Hughes, spokeswoman for Arizona State University. By the way, the difference between Mars’ highest point (the top of Olympus Mons) and lowest point (Hellas impact basin) is nearly 19 miles (31 km). Whereas, the difference between Earth’s highest (the top of Mt. Everest) and lowest (Mariana Trench) is only 12 miles (20 km). Mars is about three times rougher than Earth (taking into account Mars’ smaller radius and, therefore, greater curvature). Also, the shield volcano, Olympus Mons, is the highest-known mountain in the solar system. Further Rea
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