Jupiter
Neptune
Diameterkm
139,820
49,528
Mass (Earth = 1)x
317.80
17.15
Surface Gravitym/s²
24.79
11.15
Mean Temperature°C
-110
-214
Distance from SunAU
5.20
30.07
Orbital Perioddays
4,331
59,800
Day Lengthhours
9.93
16.11
Known Moons
95
16
Axial Tilt°
3.13
28.32
Orbital Velocitykm/s
13.07
5.43
Quick Facts
Jupiter
- -Jupiter's Great Red Spot is a storm large enough to swallow Earth and has been raging for at least 350 years.
- -Jupiter has the shortest day of any planet -- it completes one rotation in just under 10 hours.
- -Jupiter's magnetic field is about 20,000 times stronger than Earth's.
- -Europa, one of Jupiter's moons, likely has more water in its subsurface ocean than all of Earth's oceans combined.
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.