Saturn
Neptune
Diameterkm
116,460
49,528
Mass (Earth = 1)x
95.16
17.15
Surface Gravitym/s²
10.44
11.15
Mean Temperature°C
-140
-214
Distance from SunAU
9.54
30.07
Orbital Perioddays
10,747
59,800
Day Lengthhours
10.66
16.11
Known Moons
146
16
Axial Tilt°
26.73
28.32
Orbital Velocitykm/s
9.68
5.43
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.
Neptune
- -Neptune has the strongest winds in the solar system, reaching speeds of up to 2,100 km/h.
- -Neptune was the first planet discovered through mathematical prediction rather than observation.
- -One year on Neptune lasts about 165 Earth years -- it has completed just one orbit since its discovery in 1846.
- -Neptune's moon Triton orbits backward (retrograde), suggesting it was captured from the Kuiper Belt.