Because launch costs and density are completely imaginary. The whole thing is predicated on launch vehicles they hope someone builds eventually. They also appear to have profoundly miscalculated their radiation shielding costs and amounts, but I'm not really motivated to calculate that correctly.

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alexnewman 2 hours ago | parent [-]

At planet we didn't have any radiation shielding. Why would spacex need it?

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rout39574 2 hours ago | parent [-]

On the planet we have tremendous radiation shielding. The van allen belt and the atmosphere, to start with.

	▲	jazzyjackson 16 minutes ago \| parent [-]
		I suppose “at planet” refers to the company Planet https://www.planet.com/products/planet-insights-platform/