Live coverage: PSLV successfully launches from India

The top secret intelligence-gathering payload for the U.S. government set for launch Tuesday on top of a Delta 4-Heavy rocket is likely the next in a line of sensitive eavesdropping satellites designed to intercept radio signals and other communications traffic from adversaries around the world.

SpaceX’s Falcon Heavy rocket could blast off for the first time as soon as Feb. 6, company founder Elon Musk said Saturday, announcing the first official target launch date for the heavy-lifter’s maiden mission from NASA’s Kennedy Space Center in Florida.

An automatic alarm in the final two minutes of the Delta 4-Heavy rocket’s countdown early Saturday forced officials to delay blastoff with NASA’s Parker Solar Probe by 24 hours.