Cold War-era stuff dominates the list of hazardous orbiting objects.
that have the highest chance of bringing on orbital doom. It's the old stuff — spent rocket stages and large, chunky satellites — launched during the Cold War era and into the early 2000s.
The sheer size of these rockets means that a collision would produce an enormous amount of space debris fragments that would turn the bad neighborhood into an even worse one, possibly triggering the, a dreaded scenario of unstoppable cascades of collisions such as the one depicted in the 2013 Oscar-winning movie"Gravity."
Darren McKnight is a Senior Technical Fellow at LeoLabs, a private California-based firm mapping orbital traffic. McKnight is a member of the International Academy of Astronautics' Space Debris Committee, where he contributes to the development of position papers on the topic of space debris mitigation. He is interested in developing technical solutions for managing the space debris problem and encouraging sustainable practices in space utilization.
Jonathan McDowell is an astronomer and astrophysicist at the Harvard–Smithsonian Center for Astrophysics. His main research focus is on black holes, quasars and sources of high-energy X-ray radiation in distant galaxies. He is a member of the team behind NASA's X-ray observatory Chandra, but has also gained prominence as a leading space debris expert. McDowell is the author and editor of Jonathan's Space Report, an e-mail-distributed newsletter documenting satellite launches.
"Debris from this single event was probably responsible for about 15% of the conjunctions [close approaches to other objects] that occurred last year," McKnight said."Every 15 minutes, we issue conjunction messages involving fragments from this collision."
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