Mars famously has the largest volcanoes known to science. The largest is
Olympus Mons, which towers 22km above the surrounding plains – over two
and a half times taller than Mount Everest. This extinct volcano is
640km wide even at its narrowest point, greater than the distance
between London and Glasgow, or Los Angeles and San Francisco. And
Olympus Mons isn’t alone in the Earth-beating stakes – three other
Martian volcanoes are more than 10km high.
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