Even the space junk designed with disposal in mind is a polluting presence around Earth, a new study has found. Those chunks of rocket and space station and dead satellites that burn up on atmospheric reentry leave miniscule traces of metal lingering...
Avgas is a specialized fuel used to power piston engine aircraft.
Jet aircraft and turbine-powered, propeller aircraft do not use avgas, but instead use fuels very similar to kerosene, which does not contain a lead additive.