Register for an account

X

Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.

X

Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

The Sciences

Ceres Hosts an Ice Volcano

New insights brought to you by the Dawn spacecraft.

By Liz KruesiDecember 21, 2016 6:00 AM
ceres.jpg
A simulated view of Ceres’ Ahuna Mons. | NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Newsletter

Sign up for our email newsletter for the latest science news

Dwarf planet Ceres, found in the asteroid belt between Mars and Jupiter, sports a weirdly tall and lonely mountain: Ahuna Mons.

After comparing it with domes on Earth, scientists now believe Ahuna Mons formed when a slushy mix of internal ice and natural antifreeze reached the surface along a duct — just as magma builds volcanoes on our planet. Once on Ceres’ surface, the Slurpee-like material couldn’t flow far, and it slowly built up a 3-mile-high ice volcano.

Discovering Ahuna Mons’ icy identity, as reported in Science in September, adds to an emerging picture of Ceres as a geologically active and watery world. This dwarf planet should be pockmarked with craters up to 500 miles across, but scientists haven’t measured one even half that size. They think some geological process is erasing the craters over hundreds of millions or perhaps a billion years. Another 2016 study found that minerals called carbonates — which need water to form — are spread across the dwarf planet, suggesting that Ceres once hosted an ancient ocean.

These hints came from Dawn, a NASA spacecraft orbiting Ceres since March 2015. “This is a geologically complex alien world, not just a chunk of rock,” says Dawn’s chief engineer, Marc Rayman.

    3 Free Articles Left

    Want it all? Get unlimited access when you subscribe.

    Subscribe

    Already a subscriber? Register or Log In

    Want unlimited access?

    Subscribe today and save 70%

    Subscribe

    Already a subscriber? Register or Log In