Enormous Volcano On Pluto Might Be The Biggest In The Outer Solar System

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Is Wright Mons, circled here, a huge ice volcano? NASA/JHUAPL/SwRI

In the inner Solar System, the biggest volcano we know of is Olympus Mons on Mars, 624 kilometers (374 miles) across and 25 kilometers (16 miles) high. But what about in the outer Solar System?

Well, that record might now belong to Pluto. If a feature known as Wright Mons on this dwarf planet is confirmed as a volcano, it will take the title of the biggest such feature beyond Mars.