Weird Mars Deposits Could Be Vast “Ice Cap” at Equator National Geographic News

Odd materials recently found on Mars have planetary scientists scratching their heads.
That’s because the materials were spotted at the red planet’s equator—but they appear to contain a large amount of water like that previously seen only at the Martian poles. The finding is based on new high-resolution radar data from the Martian subsurface, which show similarities between the properties of deposits on a hilly equatorial formation called Medusae Fossae and the sediments at the ice-rich poles.