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General and Exploration

• Where did Mercury get its name from?
• What are the best times for viewing Mercury from Earth?
• Why can Mercury be seen only right before dawn or after sunset?
• Why don't we ever see Mercury directly overhead at midnight?
• How big is Mercury, in terms of Earth radii?
• How fast does Mercury rotate?
• Why does Mercury rotate three times on its axis for every two revolutions around the Sun?
• Is Mercury more similar to the Earth, the Moon, Venus, or Mars?
• To what extent have we explored Mercury?

Surface and Atmosphere

• Which object in the solar system has a surface that most resembles that of Mercury?
• What are the differences/similarities between the Moon and Mercury?
• What does the surface of Mercury look like?
• How can we explain the unusual cliffs or scarps on Mercury?
• What is a special feature of Mercury's surface?
• What kind of atmosphere does Mercury have?
• Why does Mercury undergo extremes in temperature?
• Why doesn't Mercury have an atmosphere?

Other

• Where is there a possibility for water ice to exist on Mercury?
• How many moons does Mercury have?