Mercury
Mercury is closest to the Sun but not the hottest planet.
Observed data
- Diameter
- 4,879 km
- Distance from Sun
- 0.39 AU
- Orbital period
- 87.97 days
- Moons
- 0
- Surface temp.
- -180°C ~ 430°C
- Gravity
- 3.7 m/s²
Observed by
- MESSENGER
- BepiColombo
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