Mercury, the closest planet to the sun, is only slightly larger than Earth's moon and is pockmarked with craters. The planet is visible to the unaided eye and as such as has long been known to humans.

"This groundbreaking discovery of Mercurian glaciers extends our comprehension of the environmental parameters that could sustain life." When you purchase through links on our site, we may earn an ...

Mercury is a planet that just doesn't make sense. It's incredibly small yet hosts a relatively massive core. Mercury is so strange that astronomers have not been able to explain its properties with ...