Saturn
Mercury
Diameterkm
116,460
4,879
Mass (Earth = 1)x
95.16
0.06
Surface Gravitym/s²
10.44
3.70
Mean Temperature°C
-140
+167
Distance from SunAU
9.54
0.39
Orbital Perioddays
10,747
87.97
Day Lengthhours
10.66
4222.60
Known Moons
146
0
Axial Tilt°
26.73
0.03
Orbital Velocitykm/s
9.68
47.36
Quick Facts
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.
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.