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This map shows the frequency of carbon dioxide frost's presence at sunrise on Mars, as a percentage of days year-round.
How much carbon dioxide snow falls every winter on Mars?
Martian polar ice caps - Wikipedia
See the Chilling Beauty of Winter on Mars, Smart News
New Study Helps Answer Mystery of What Happened to Mars' Early Atmosphere - AmericaSpace
Dry ice hints Mars was once wetter than thought
Chinese Explorer Finds Signs of Recent Water on Mars
NASA's MAVEN Mission Investigates Mars' Atmosphere
Mars Exploration: Multimedia
Glaciers on Mars
Atmosphere of Mars - Wikipedia
What Happened to Early Mars' Atmosphere? New Study Eliminates One Theory – NASA Mars Exploration