WASHINGTON — NASA is delaying the launch of three missions to study the sun by several months because of issues with the primary payload. In a statement issued after the close of business Dec. 20, NASA announced the launch of its Interstellar Mapping and Acceleration Probe (IMAP) spacecraft on a Falcon 9, previously scheduled for the spring of 2025, had been pushed back to no earlier than September. The agency said only that the delay gives “additional time for IMAP flight systems preparations prior to launch.” A Dec. 18 preview…
