What does the term LEO mean in reference to communication satellites?
Low Energy Orbit, which conserves battery power
Low Elevation Orbit, which appears close to the horizon from the earth station
Low Equilibrium Orbit, which has a slightly unstable period
Low Earth Orbit, which has a period of around 100 minutes✓Correct answer
Explanation
LEO stands for Low Earth Orbit, a few hundred kilometers up, and orbital mechanics fixes the period from the altitude: at roughly 600 km the orbital period works out near 96 minutes, hence the figure of around 100 minutes. This short period is why LEO satellite passes last only minutes and require tracking.