What did radar astronomers find in the polar regions of Mercury?
A) polar caps of dry ice that vary seasonally, much like Mars
B) auroral displays much like Earth's
C) temperatures cold enough to allow thin sheets of water ice
D) rift valleys
E) large mare basins, such as near our Moon's south pole

Question

Quizplus · Accepted Answer

Radar astronomers discovered that the polar regions of Mercury have temperatures cold enough to allow thin sheets of water ice to exist. This finding was surprising given Mercury's close proximity to the Sun, but the ice persists in permanently shadowed craters where sunlight never reaches.

What Did Radar Astronomers Find in the Polar Regions of Mercury