Google just opened talks with SpaceX to launch data centers in orbit. Google already owns 6.1% of SpaceX. That stake traces back to a $900 million check Google wrote in January 2015 at a $12 billion valuation. SpaceX is preparing the largest IPO in history this summer at $1.75 trillion. Google's slice clears roughly $107 billion on paper, a 119x return on a single check. The orbital data center pitch is the SpaceX IPO growth story. Without it, the company is rockets plus Starlink, both known…