Notre plannete, la Terre
Mass (kg)............................................5.98 x 10^24
Diameter (km)........................................12756
Mean density (kg/m^3) ...............................5520
Escape velocity (m/sec)..............................11200
Average distance from Sun (AU).......................1
Rotation period (length of day) (in Earth hours).....23.93
Revolution period (length of year) (in Earth days)...365.26
Obliquity (tilt of axis) (degrees)...................23.4
Orbit inclination (degrees)..........................0
Orbit eccentricity...................................0.017
Mean surface temperature (K).........................281
Maximum surface temperature (K)......................310
Minimum surface temperature (K)......................260
Visual geometric albedo..............................0.39
Highest point on surface.............................Mount Everest
(over 8 km above sea-level)
Atmospheric components...............................78% nitrogen,
21% oxygen,
1% argon
Surface materials....................................basaltic and
granitic rock and
altered materials
Le satelite naturel de la terre, la Lune