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A comment on Starship / Super Heavy. Parent comment

Re:Starship / Super Heavy by wolfram74 on Saturday December 26, 2020 @11:24PM (#25548805)
Given most buildings are upwards of 90% air by volume, that's still quite dense.
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Re:Starship / Super Heavy by heavenlyblue on Sunday December 27, 2020 @07:01AM (#25550454)
Wanted to argue with you but apparently concrete is only 2.5g/cm3 so not that much different from water.
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Re:Starship / Super Heavy by stjohnswarts on Sunday December 27, 2020 @11:32PM (#25556704)
There have been ships made of concrete which I always found interesting. Ferrocement (I believe) is a form of boatcraft that can be done in your backyard without any special tools.
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