Earth
Venus
Diameterkm
12,742
12,104
Mass (Earth = 1)x
1.00
0.81
Surface Gravitym/s²
9.81
8.87
Mean Temperature°C
+15
+462
Distance from SunAU
1.00
0.72
Orbital Perioddays
365.25
224.7
Day Lengthhours
24.00
2802.00
Known Moons
1
0
Axial Tilt°
23.44
177.36
Orbital Velocitykm/s
29.78
35.02
Quick Facts
Earth
- -Earth is the only planet not named after a Greek or Roman deity.
- -Earth's rotation is gradually slowing -- days are getting about 1.4 milliseconds longer per century.
- -About 71% of Earth's surface is covered by water, but 96.5% of that water is in the oceans.
- -Earth's magnetic field has flipped its polarity hundreds of times over millions of years.
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.