The multi-ton Exposed Pallet 9 (EP9) was jettisoned from the space station back in March 2021. At the time, it was reported to be the most massive object ever tossed overboard from the International Space Station. Disposing of used or unnecessary equipment in such a way is common practice aboard the space station, as the objects typically burn up harmlessly in Earth’s atmosphere.
Ahead of EP9’s reentry, the Federal Office for Civil Protection and Disaster Relief, National Warning Center 1 in Bonn, Germany issued this information… “The object is battery packs from the International Space Station. Luminous phenomena or the perception of a sonic boom are possible….” EP9 is loaded with old Nickel-Hydrogen batteries, NASA explained at the time it was jettisoned, also explaining that EP9 has the approximate mass of a large SUV and predicting it would re-enter Earth’s atmosphere in two-to-four years.
“A large space object reenters the atmosphere in a natural way approximately once per week,” the European Space Agency points out, “with the majority of the associated fragments burning up before reaching the ground.
“Most spacecraft, launch vehicles and operational hardware are designed to limit the risks associated with a reentry.”