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Mercury (planet) - Wikipedia
Mercury - NASA Science
Mercury | Facts, Color, Size, & Symbol | Britannica
Mercury Facts - Interesting Facts about Planet Mercury - Space Facts
Mercury: Facts - NASA Science
All About Mercury | NASA Space Place – NASA Science for Kids
Mercury: A complete guide to the closest planet to the sun - Space.com
Planet Mercury, explained - National Geographic
Mercury: Size, distance from the Sun, orbit | Astronomy.com
Planet Mercury | Natural History Museum