What differentiates high Earth orbit from low Earth orbit?

• A. High Earth orbit is within 160 km of Earth
• B. Low Earth orbit is above 35,786 km
• C. Low Earth orbit is between 160 km and 2,000 km
• D. High Earth orbit is below 160 km

Answer: (C)

The distinction between high Earth orbit and low Earth orbit primarily lies in their respective altitudes. Low Earth orbit is defined as the region between approximately 160 kilometers (about 99 miles) and 2,000 kilometers (about 1,242 miles) above the Earth's surface. This specific range allows satellites in low Earth orbit to maintain relatively low latency in communications and is ideal for certain applications like Earth observation and human spaceflight.

High Earth orbit, on the other hand, generally refers to orbits that are beyond this range, typically starting from around 35,786 kilometers (approximately 22,236 miles) where geostationary orbits are located. Thus, the choice indicating that low Earth orbit lies between 160 km and 2,000 km effectively captures the unique characteristics of this altitude range, differentiating it clearly from high Earth orbit.