Northrop Grumman built and operated the components that failed during the controversial January launch of the U.S. spy satellite known as Zuma, WSJ reported over the weekend. From a report: Two independent investigations, made up of federal and industry officials, pointed to Northrop's payload adapter as the cause of the satellite's loss, the report said, citing people familiar with the probes. The payload adapter is a key part of deploying a satellite in orbit, connecting the satellite to the upper stage of a rocket. Zuma is believed to have cost around $3.5 billion to develop, according to the report. The satellite was funded through a process that received a lesser degree of oversight from Congress compared with similar national security-related satellites, industry officials said.