The speed above which friction with an atmosphere may damage a spacecraft. The heat barrier is of particular importance during reentry. Special systems are needed to cool the spacecraft when it goes beyond the heat barrier speed. Found on http://www.daviddarling.info/encyclopedia/H/heat_barrier.html
The speed above which friction with an atmosphere may damage a spacecraft. The heat barrier is of particular importance during reentry. Special systems are needed to cool the spacecraft when it goes beyond the heat barrier speed.