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Comment by georgeg23 | Hacker News Reader

Given the Chinese have been complaining to the UN for the last year about American Low Earth Orbit satellites spying on them (Starshield, Space Development Agency, etc..) this balloon thing is pretty clever.

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Also maybe gives China cover/justification to start shooting down these low satellites.

That’s an escalator that China can’t afford to ride.

The US would deorbit everything China ever put into space if they started shooting at satellites. Those satellites are part of the strategic triad and would be a direct threat to the US nuclear umbrella. The AEGIS systems off the Chinese coast would take care of any attempts to add satellites back into space.

Low-Earth orbit satellites are not currently part of triad (but may be part of a future nuclear defense shield / interceptor system). They are also much easier to shoot down.

See Space Development Agency https://en.m.wikipedia.org/wiki/Space_Development_Agency

That's what China has been most upset about at United Nations.

There are some rumors that the ICON was shot down by the Chinese (No facts are found supporting those rumors): https://en.wikipedia.org/wiki/Ionospheric_Connection_Explore...

That happened last month in November 2022. It mysteriously destroyed itself.

Curious, are all satellites known? I’m sure there are hundreds of unknown, untracked, secret satellites floating around?

No. Shooting down satellites is a very different thing.

China hasn’t indicated it cares a great deal about international law.

(One could make the same argument for the U.S., but that’s not the open question at the moment.)

If China didn't care about international law it would've said it sent the balloon on purpose. Instead it found a cover story of some civilian balloon gone awry. They cared enough about international law to lie.

International law’s got nothing to do with it. Basically Every spacefaring has made it their policy that an attack on one of their satellites would be treated as an act of war and everything would be on the table in terms of retaliation

Because they fly a bit higher?

Yes. Sovereign airspace versus not.

Also Kessler syndrome.

I wouldn’t put it past the Chinese to deploy islands of atmosphere and release air in low earth orbit, and then declare that it is now part of the Chinese atmosphere before they start shooting down satellites.

I don't see an equivalency. Low Earth Orbit satellites are above the ionosphere, balloons below. I suspect if it is radio traffic that you are interested in listening in on then one of those is much more effective.

LEO satellites are great for RF reconnaissance for frequencies between 100MHz and 100GHz which easily penetrate the ionosphere. They can even geolocate the source on the ground by measuring the observed Doppler shift (caused by the spy satellites own fast motion)

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