Mercury has much more ice scattered across its north pole than previously thought , new research suggests — both inside craters as well as in shadowed terrain between them. The small deposits add to a significant amount of previously unrecognized water ice, researchers said in a statement .
Mercury may seem like a surprising place to find ice : Although nights can get as cold as minus 275 degrees Fahrenheit (minus 170 degrees Celsius), temperatures can soar to 840 degrees F (450 degrees C) during the day. This is more than hot enough to boil away any water on the surface.
But Mercury's axis has very little tilt, so its polar regions don't receive much direct sunlight. This keeps the floor of some of its polar craters in perpetual shadow, researchers said in the statement. Mercury also has almost no atmosphere to hold in ambient heat, so the temperatures in these craters stay low enough for water to remain frozen. [ Water Ice on Mercury: How It Stays Frozen (Infographic)
https://www.space.com/38274-mercury-has-surprisingly-icy-north-pole.html
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Interesting that the pole gets very little sunshine because it axis has very little tilt. Didn't know that.