Generally, satellites do not fly below _____ km.
Show answer & explanation
Correct answer: B
Explanation
Satellite Altitude and Atmospheric Resistance
Artificial satellites require a certain altitude and speed to remain in space. Although the official beginning of space is considered to be 100 km (the Kármán line), satellites typically do not fly below 180–200 km.
Atmospheric Drag: Below 180 km, the Earth's atmosphere is so dense that it exerts significant friction on the satellite.
Speed Deceleration: This friction causes the satellite to slow down. If the speed decreases, Earth's gravity pulls it down, and the satellite burns up in the atmosphere.
Stable Orbit: The minimum practical altitude for maintaining a stable orbit is considered to be approximately 180 km, minimizing atmospheric drag.