Uranus
Mars
Diameterkm
50,724
6,779
Mass (Earth = 1)x
14.54
0.11
Surface Gravitym/s²
8.87
3.72
Mean Temperature°C
-220
-65
Distance from SunAU
19.19
1.52
Orbital Perioddays
30,589
687
Day Lengthhours
17.24
24.66
Known Moons
28
2
Axial Tilt°
97.77
25.19
Orbital Velocitykm/s
6.80
24.07
Quick Facts
Uranus
- -Uranus rotates on its side with an axial tilt of 97.77°, likely caused by a massive ancient collision.
- -Uranus was the first planet discovered with a telescope, found by William Herschel in 1781.
- -All 28 of Uranus's moons are named after characters from Shakespeare and Alexander Pope.
- -Uranus's blue-green color comes from methane in its atmosphere absorbing red light.
Mars
- -Olympus Mons on Mars is about 21.9 km tall -- nearly three times the height of Mount Everest.
- -A Martian day (sol) is 24 hours and 37 minutes, remarkably similar to an Earth day.
- -Mars has seasons like Earth because its axial tilt (25.19°) is very similar to Earth's (23.44°).
- -Dust storms on Mars can grow large enough to engulf the entire planet and last for months.