Google just launched four of its AI chips into orbit on a Falcon 9, and the whole project hinges on one number buried in its own research paper. At $200 per kilogram to low Earth orbit, launching a data center starts to cost about the same as powering one on Earth. That math sounds crazy until you see what terrestrial data centers actually pay. $570 to $3,000 per kilowatt per year for electricity, plus years stuck in grid interconnection queues before a single server turns on. The satellite…