Wright Mons is enormous, and with a measurement of 90 miles across and 2.5 miles high, it's a candidate for being the biggest volcano discovered outside our planet so far. It is, however, considerably smaller than Mauna Loa, one of the biggest (if not the biggest) volcanoes on Earth which stands 5.7 miles tall from base to summit. If Wright Mons is indeed a cryovolcano (another term for the land formation), then it doesn't spew out lava like the ones we're used to. Instead, it ejects a mixture of ice and gases, such as nitrogen, methane and ammonia.

[Image credit: NASA/JHUAPL/SwRI]