The Moon Is Rusting, and Researchers Want to Know Why
While our Moon is airless, research indicates the presence of hematite, a form of rust that normally requires oxygen and water. That has scientists puzzled.
Mars has long been known for its rust. Iron on its surface, combined with water and oxygen from the ancient past, give the Red Planet its hue. But scientists were recently surprised to find evidence that our airless Moon has rust on it as well.
A new paper in Science Advances reviews data from the Indian Space Research Organization’s Chandrayaan-1 orbiter, which discovered water ice and mapped out a variety of minerals while surveying the Moon’s surface in 2008. Lead author Shuai Li of the University of Hawaii has studied that water extensively in data from Chandrayaan-1’s Moon Mineralogy Mapper instrument, or M3, which was built by NASA’s Jet Propulsion Laboratory in Southern California. Water interacts with rock to produce a diversity of minerals, and M3 detected spectra – or light reflected off surfaces – that revealed the Moon’s poles had a very different composition than the rest of it.