What is the primary cause of intense heat during spacecraft re-entry?
Answer
Friction with the atmosphere
As a spacecraft returns to Earth, it descends through the dense layers of the atmosphere at extremely high velocities. The kinetic energy of this movement is rapidly dissipated as the spacecraft encounters atmospheric drag. This interaction creates massive friction, which acts to slow the vehicle down but also converts the motion into intense heat. This process causes the exterior of the spacecraft to reach temperatures in excess of 1,600 degrees Celsius, necessitating robust thermal protection systems.
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