What is re entry speed?

Re-entry speed refers to the velocity at which a spacecraft returns to the Earth's atmosphere from space. This speed is crucial because it determines the heat and stress the spacecraft will experience during atmospheric re-entry, impacting its design and the materials used for thermal protection. Typical re-entry speeds can range from about 17,500 mph (28,000 km/h) for low Earth orbit missions to higher speeds for missions returning from greater distances, such as lunar or interplanetary missions. Proper management of re-entry speed is essential for ensuring the safety and success of the mission.