alt Hacker NewsIf the Starlink satellites all collided, the worst case is that we would have to ditch the space station (which is already planned in a few years) and wait a few years to launch more into LEO. The debris deorbits automatically due to atmospheric drag. And in the meantime we would still be able to launch through the cloud to higher orbits or escape velocity as it wouldn't be dense enough to hit something that only passes though for a couple of minutes.
IMO now that LEO communication satellites are feasible we should ban launching satellites into higher orbits. Collision debris up there is much, much worse because it's essentially permanent. It will not deorbit by itself for thousands of years or more, and there is no plausible way to clean it up even with technology much more advanced than ours.
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It's not just starlink up there, at minimum NRO will be sad and unable to track nuclear weapons and such, the US military will be down a satellite coms systems, and there are probably some people which use starlink for something important.
a collision can send debris into an orbit with a higher eccentricity. these orbits may not last very long as they would also have a lower perigee.
Even though most of the satellites affected would be other Starlinks, I don't think the many entities with other spacecraft in sub 550km LEO would be particularly delighted to lose them (and the ability to safely relaunch for 5 years)
Satellites in higher orbits do a lot that can't be done in LEO and typically have much lower collision risk (though GEO is fairly crowded). There are plenty of plausible candidate technologies for cleaning up debris, just few practical demonstrations (and even tracking smaller pieces is work in progress)
> the worst case is that we would have to ditch the space station (which is already planned in a few years)
There is more than one Space Station up there. "Tianhe space station module conducted preventive collision avoidance due to close approaches by the Starlink-1095 (2020-001BK) and Starlink-2305 (2021-024N) satellites on July 1 and Oct. 21 respectively." [1]. Wikipedia also has a long list of planned and proposed space stations.
1. https://www.n2yo.com/satellite-news/Chinas-space-station-man...
There actually is one idea for cleaning up debris in high orbit: You launch tons of very fine powder into the orbits you wish to clear. These orbiting particles create drag on anything up there, so that their orbits degrade much faster. But the because the particles themselves are so tiny, they have a very low ballistic coefficient, and will deorbit quickly.
More: https://caseyhandmer.wordpress.com/2019/10/25/space-debris-p...