NASA's probe has recently captured new images on Mercury. They have found features on the surface that they call hollows, known as “irregularly shaped flat floored depressions.” They are over ten meters deep and barely a kilometer wide. The scientists, including David Blewett who is from John Hopkins Applied Physics Laboratory, gathered from this observation that Mercury is losing some sodium and potassium, because those are lighter weight. These hollows surprised scientist and they weren’t something they expected to see. These hollows are fairly young, because of the small size. The scientist says they would have eroded over time, which they have not done yet.
"Strange 'Hollows' on Mercury Revealed by NASA Probe : DNews." DNews. Web. 6 Apr. 2015. <http://news.discovery.com/space/strange-hollows-on-mercury-revealed-by-nasa-probe-150406.htm>.
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