But the pieces of Kosmos 2499 are orbiting at an altitude of about 1,200 km — so high that they'll probably be there for a century or longer before Earth's atmosphere drags them down and burns them up, according toKosmos 2499 is one of three satellites that Russia launched secretly from 2013 to 2015. Its beginning is even more mysterious than its end.
A few months later, Russia admitted to the United Nations that it had launched a fourth satellite, which came to be known as Kosmos 2491. Its purpose was unclear. For nearly half a year, this mystery satellite trailed its rocket stage and maneuvered up close to it repeatedly. Then it transmitted telemtry data back to Earth in Morse code, according to Zak.
"This suggests to me that perhaps these events are the result of a design error in the fuel tanks or other systems that are rupturing after several years in space rather than something like a collision with a piece of debris," Weeden told ArsTechnica.
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