Mars
Uranus
Diameterkm
6,779
50,724
Mass (Earth = 1)x
0.11
14.54
Surface Gravitym/s²
3.72
8.87
Mean Temperature°C
-65
-220
Distance from SunAU
1.52
19.19
Orbital Perioddays
687
30,589
Day Lengthhours
24.66
17.24
Known Moons
2
28
Axial Tilt°
25.19
97.77
Orbital Velocitykm/s
24.07
6.80
Quick Facts
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.
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.