September 30, 2011
Hollows found on Mercury's Surface
Data returned from NASA's messenger satellite orbiting Mercury shows that the planet closest to the sun in our has many irregular depressions in its surface. The depressions "seem to form in bright deposits that have been excavated where meteorites have impacted the surface," according to BBC. The scientists still don't know the cause of the depressions, but they have noted that similar depressions are found on Mars, where they are most likely the consequence of evaporating carbon dioxide ice. Since there is no carbon dioxide ice on Mercury, it must be some other kind of material. Scientists believe that there might be some component in Mercury rocks that become unstable when exposed to the surface. Because of this some argue that Mercury was bigger in the past but the outer layers evaporated away because of the intense glare of the sun.
Posted by ghanafin at September 30, 2011 10:18 PM