Mercury
Saturn
Diameterkm
4,879
116,460
Mass (Earth = 1)x
0.06
95.16
Surface Gravitym/s²
3.70
10.44
Mean Temperature°C
+167
-140
Distance from SunAU
0.39
9.54
Orbital Perioddays
87.97
10,747
Day Lengthhours
4222.60
10.66
Known Moons
0
146
Axial Tilt°
0.03
26.73
Orbital Velocitykm/s
47.36
9.68
Quick Facts
Mercury
- -Mercury's day-night cycle lasts 176 Earth days -- longer than its year of 88 Earth days.
- -A person weighing 68 kg on Earth would weigh only 25.7 kg on Mercury.
- -Mercury has ice in permanently shadowed craters near its poles despite surface temperatures reaching 430°C.
- -Mercury is shrinking -- its circumference has decreased by about 14 km as its core slowly cools and contracts.
Saturn
- -Saturn is less dense than water (0.687 g/cm³) -- it would float in a bathtub large enough to hold it.
- -Saturn's rings are mostly ice and extend up to 282,000 km from the center, but are only about 10 meters thick.
- -Saturn has 146 confirmed moons, the most of any planet in the solar system.
- -Winds near Saturn's equator can reach 1,800 km/h -- the fastest in the solar system.