Neptune
Venus
Diameterkm
49,528
12,104
Mass (Earth = 1)x
17.15
0.81
Surface Gravitym/s²
11.15
8.87
Mean Temperature°C
-214
+462
Distance from SunAU
30.07
0.72
Orbital Perioddays
59,800
224.7
Day Lengthhours
16.11
2802.00
Known Moons
16
0
Axial Tilt°
28.32
177.36
Orbital Velocitykm/s
5.43
35.02
Quick Facts
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.
Venus
- -Venus spins so slowly that its day (243 Earth days) is longer than its year (225 Earth days).
- -Venus is the hottest planet in the solar system at 462°C, despite Mercury being closer to the Sun.
- -Venus rotates in the opposite direction to most planets, so the Sun rises in the west and sets in the east.
- -The atmospheric pressure on Venus's surface is 92 times that of Earth -- like being 900 meters underwater.