In the realm of space debris, one of the main causes of inorbit explosions is related to residual fuel that remains in tanks or fuel lines that remain on board once a rocket stage or satellite has been discarded in Earth orbit. ESA is investigating new valves that could be activated at the end of the missions to vent all the remaining propellant. Read more http://blogs.esa.int/cleanspace/2017/07/21/sma-valves-to-prevent-in-orbit-explosions/
