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Planets Mercury
Discovery
Discovered By
Unknown
Discovery Site
Unknown
Discovered At
Prehistoric
Physical Characteristics
Mean Diameter
Volume
Mass
Mean Density
Surface Gravity
Mean Temperature
Atmosphere Characteristics
Surface Pressure
Composition
42% O, 29% Na, 22% H
Surroundings
Natural Satellites
0
Ring System
No
Global Magnetic Field
Yes
Orbital Characteristics
Median Orbital Radius
Apoapsis / Aphelion
Periapsis / Perihelion
Sideral Orbital Period
Sideral Rotation Period
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