Dwarf Planet Ceres May Hold a Massive Ice Volcano


Lots of folks may still be salty over Pluto’s “demotion” from planet to dwarf planet, but it’s becoming apparent that the little worlds with this designation are anything but boring. In a set of six studies published Thursday in Science, researchers report that Ceres — a dwarf planet in the asteroid belt between Mars and Jupiter — plays host to many intriguing geological features, including a massive ice volcano.

Ceres is now being orbited by NASA’s Dawn spacecraft. According to one of the new studies from the Dawn team, a 13,000-foot mountain dubbed Ahuna Mons may actually be a cryovolcano. The surface temperature on Ceres hovers around minus-40 degrees Fahrenheit. Under those conditions, water can freeze as hard as rock, forming sturdy mountains that can reach incredible heights.

But the researchers think Ahuna Mons is even cooler than a giant ice mountain — they think it’s a giant ice volcano, and one that formed relatively recently to boot. They couldn’t find any signs of tectonic activity that would have formed the mountains, so they think it must have erupted out of the planet’s surface instead.

Just as a volcano made of solid rock will sometimes spew molten magma, cryovolcanoes sometimes spit out liquid water. Scientists believe Ahuna Mons was formed when some of this molten material pushed up against the surface, squeezing enough to create a raised dome but not quite enough to burst it. This is particularly exciting because Ceres doesn’t contain the same planetary ingredients as other worlds found to host volcanoes — instead of being primarily rocky or icy, the body is made of a mix of salts, muddy rocks and water ice — which suggests that this kind of geologic activity might be more common in the solar system than previously assumed.

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SOURCE: The Washington Post, Rachel Feltman