The Falcon 9 rocket will carry Zuma, a USA government spacecraft, into low-Earth orbit.
This launch has been delayed previously, in part due to weather, but the launch window opened again this evening at 5 p.m.
The Zuma mission is a mystery, but it has been identified as a government payload managed by Northrop Grumman, according to Florida Today. The first stage of the Falcon 9 rocket then returned for a vertical landing at Landing Zone 1 at Cape Canaveral.
Elon Musk's SpaceX is set to once again launch its mysterious Zuma mission January 5, after it was pushed back last November.
That mission last summer was observed flying close to the International Space Station, at a time when two US cargo craft arrived or departed. That would place Zuma near the others once in orbit, perhaps not by coincidence. SpaceX said it needed to review a potential issue with the Falcon 9 rocket's nose cone that cropped up in testing. The launch had been pushed back several times since late 2017, with the past week's "extreme weather" on the East Coast contributing to the most recent delay.
SpaceX now can look forward to its next major test for the year - launching its huge heavy-duty rocket for the first time ever. It's aiming for more this year. This is SpaceX's third classified mission, and arguably its most secretive flight for the United States military. It's likely the feed will go live around 7:45pm ET, a few minutes prior to the launch window.
The 45th Space Wing on Tuesday is scheduled to deliver its year-ahead forecast of local launch activity to the National Space Club Florida Committee. The company has successfully launched "Zuma", a mysterious government payload, into orbit from Cape Canaveral.
United States could freeze $2B in aid to Pakistan
The official also said the suspension is mostly about the security assistance and does not include civilian assistance. He said that doubting intent of Pakistan would affect joint efforts of peace and stability in the region.