1. THE PLANETS Marcus winston

4. Mercury is the smallest and innermost planet in the Solar System. Its orbital period is less than any other planet in the Solar System. Seen from Earth, it appears to move around its orbit in about 116 days. It has no known natural satellites. MassMass: 3.285 × 10^23 kg (0.055 M ⊕ ) Length of dayLength of day: 58d 15h 30m Orbital periodOrbital period: 88 days GravityGravity: 3.7 m/s² Surface areaSurface area: 28.88 million mi² RadiusRadius: 1,516 m