Pluto
Earth
Diameterkm
2,377
12,742
Mass (Earth = 1)x
0.00
1.00
Surface Gravitym/s²
0.62
9.81
Mean Temperature°C
-230
+15
Distance from SunAU
39.48
1.00
Orbital Perioddays
90,560
365.25
Day Lengthhours
153.29
24.00
Known Moons
5
1
Axial Tilt°
122.53
23.44
Orbital Velocitykm/s
4.67
29.78
Quick Facts
Pluto
- -Pluto was reclassified from planet to dwarf planet in 2006 by the International Astronomical Union.
- -Pluto's largest moon Charon is so large (half Pluto's diameter) that they orbit a point between them, forming a binary system.
- -Pluto's famous heart-shaped feature, Sputnik Planitia, is a vast plain of nitrogen ice over 1,000 km across.
- -One year on Pluto takes 248 Earth years -- it hasn't completed a single orbit since its discovery in 1930.
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.