The research, published in the journal Scientific Reports, notes the planet’s surface is not caused by the result of quakes, but rather “volatiles,” which can switch elemental states rather quickly.
“For nearly half a century, it was considered that these terrains formed due to catastrophic quakes and ejecta fallout produced by the antipodal Caloris basin impact,” researchers wrote in the study’s abstract.
“Currently documented evidence of surface modifications due to the removal of volatiles includes Mercury’s hollows, which are shallow, flat-floored, irregular, rimless depressions with bright interiors, and halos,” they added. “These features are relatively small, exhibiting an average depth of 24 ± 16 m13. Therefore, their origin is thought to represent minor mass losses produced by the local sublimation of near-surface geologic material that included large volumes of volatiles (i.e., volatile-rich compounds).”
Speaking with The New York Times, one of the study’s co-authors, Jeffrey Kargel, said he thought his co-researcher, Alexis Rodriguez, was wrong. Upon further review, he realized the idea wasn’t so outlandish.
“It is possible that as long as there was water, the temperatures would be appropriate for the survival and possibly the origin of life,” Kargel told the news outlet.
“I thought Alexis had lost it at some point,” he added. “But the more I dug into the geologic evidence and the more I thought about the chemistry and physical conditions there, the more I realized that this idea — well it might be nuts, but it’s not completely nuts.”
Rodriguez, who is a senior scientist at the Planetary Science Institute, spends the majority of his time studying “areas of interest are related to the study of the Martian subsurface hydrology.”
In 2014, NASA’s MESSENGER spacecraft took the first-ever photos of water ice the planet’s north pole, Space.com reported.
It’s believed Mercury’s icy regions are slightly different than those seen on the Moon, according to an August 2019 study on the topic.
“We showed Mercury’s polar deposits to be dominantly composed of water ice and extensively distributed in both Mercury’s north and south polar regions,” Nancy Chabot, instrument scientist for MESSENGER’s Mercury Dual Imaging System, said in August. “Mercury’s ice deposits appear to be much less patchy than those on the moon, and relatively fresh, perhaps emplaced or refreshed within the last tens of millions of years.”