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March 20, 2021 05:34 pm

2.9-Ton Battery Pallet Becomes Largest Mass Ever Discharged From Space Station

"A pallet of batteries was released from the International Space Station last week, becoming the heaviest single piece of junk ever jettisoned from the station," reports UPI: Mission controllers in Houston commanded the Canadarm2 robotic arm to release an external pallet loaded with the 2.9 tons of nickel-hydrogen batteries into Earth's orbit Thursday morning. "It is safely moving away from the station and will orbit Earth between two to four years before burning up harmlessly in the atmosphere," NASA said in a statement. Gizmodo shares a photo of the pallet orbiting 265 miles (427 km) above Chile. And they add that this chain of events starte in 2011 when NASA decided to switch the Space Station from nickel-hydrogen batteries to lithium-ion batteries.This effort required four supply missions from the Japanese H-II Transfer Vehicle (HTV) cargo spacecraft, 13 different astronauts, and 14 spacewalks, in which 48 nickel-hydrogen batteries were replaced by 24 lithium-ion batteries... "It used to be that it wasn't a big deal to toss stuff from ISS because very few satellites were below it [at altitudes below 250 miles (400 km)], " Jonathan McDowell, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics, explained in an email. "That's not so true any more with a bunch of cubesats and with recently launched Starlinks during orbit raising. So I have concerns." To which he added: "I don't immediately see what else they could have done except fly a whole extra HTV mission just to get rid of it." According to the European Space Agency, around 34,000 objects larger than 3.9 inches (10 cm) are currently in orbit around Earth, in addition to millions of tinier objects, such as tools and bits of spacecraft. The volume of objects in space, both functional and non-functional, is steadily increasing, prompting concerns of potential collisions and even more orbital debris. A NASA representative told Gizmodo their ballistics officers "indicate no threat" of the pallet smashing into other space objects, but added "this item, like all, will be tracked by U.S. Space Command."

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