Large WANs use satellites to transfer data.
Satellites orbit the Earth in three tiers:
Geostationary earth orbit (GEO)
Medium-earth orbit (MEO)
Low-earth orbit (LEO)
geostationary earth orbit (GEO) The orbit in which satellites fly at 22,000 miles above the earth in fixed positions.
medium-earth orbit (MEO) The orbit in which satellites fly between 6,250 and 12,500 miles above Earth.
low-earth orbit (LEO) The orbit in which satellites fly between 310 and 1,240 miles above Earth.