It "just" embeds a tiff file. Maybe your browser is fooling you.
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160,000 km -> 160,000 km^2 (seems slashdot doesn't like superscript, ASCII code 253)
Note that an square of 400 x 400 km equals 160,000 km, not 400 km.
The amount of materials needed to cover such a square with a solar plant probably exceeds the world's production capacity for iron, aluminium etc in a calendar year (I made some rough numbers some years ago).
That is without counting the energy needed to build such a plant...
Actually he considered the first 1 million primes, not the primes until 1 million, I would say that is unbiased, but I might well be wrong.
Because with different architectures you need different OS and apps?