08/01/2023
Mars has the solar system's biggest volcano.
At 13.6 miles high and 370 miles wide, Olympus Mons on Mars' western hemisphere is the largest volcano in our solar system.
It's unknown whether this volcano is still active. But what we do know is that Olympus Mons was able to grow so big because Mars, unlike Earth, has no shifting tectonic plates, so the mountain simply sits over a hot spot that gives it a constant supply of lava.