Satellites	
    1 natural satellite: the Moon
    5 quasi-satellites
    >1 800 operational artificial satellites
    >16 000 space debris
Physical characteristics
Mean radius
    6371.0 km (3958.8 mi)
Equatorial radius
    6378.1 km (3963.2 mi)
Polar radius
    6356.8 km (3949.9 mi)
Circumference	
    40075.017 km equatorial (24901.461 mi)
    40007.86 km meridional (24859.73 mi)
Surface area
    510072000 km2 (196940000 sq mi)
    148940000 km2 land (57510000 sq mi; 29.2%)
    361132000 km2 water (139434000 sq mi; 70.8%)
Volume	1.08321×1012 km3 (2.59876×1011 cu mi)
Mass	5.97237×1024 kg (1.31668×1025 lb)
Mean density
    5.514 g/cm3 (0.1992 lb/cu in)
Surface gravity
    9.80665 m/s2 (1 g; 32.1740 ft/s2)