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The starlink satellites are designed to burn up in the atmosphere. They do this pretty often. But there's plenty of other space junk that's not designed to burn up and should have shown up on radar.
> The starlink satellites are designed to burn up in the atmosphere. How high in the atmosphere, though? They're not likely to hit the ground, sure, but 36,000 feet isn't the ground. Second, designs fail. 432 Park was designed not to have cracking and spalling concrete, yet NYT has a story today about exactly those things. Third, people lie about designs and capabilities. Pretty sure anyone who has ever worked in com…
The atmospheric entrance for these (starlink) sattelites is basically as shallow as possible, so the object spends the most time possible in high atmosphere (think 60-90 km, where the atmo is thick enough to engulf the object in plasma, yet extert low pressure to slow it down, prolonging the time its burning. In otherwords, you couldnt achieve better parameters to burn stuff on deorbit.
All of it will probably be fully burned way before 50km - planes fly at 8-12