SpaceX Falcon Heavy on the launchpad for the STP-2 mission. SpaceX The most powerful rocket from Elon Musk's SpaceX is set to take to the skies once again. Falcon Heavy is scheduled for its first nighttime launch late on Monday, June 24 (Tuesday, June 25 in some places). This will be the rocket system's third flight and it marks a historic point in reusability for the Heavy, with the two side boosters being reused for the first time. By SpaceX's own admission, the launch will be among the most challenging in the company's history. NASA, which has some payloads on board, will livestream the proceedings starting at 8 p.m. PT from Launch Complex 39A at the Kennedy Space Center in Florida. The actual launch window opens at 8:30 p.m. PT and will remain open for approximately four hours. The latest update from SpaceX suggests the launch will occur at 2:30 a.m. ET, which corresponds to a late kick-off for the West Coast at 11:30 p.m. PT. Targeting T-0 of 2:30 a.m. EDT for Falcon Heavy launch of STP-2; team completed additional ground system checkouts. Vehicle and payload continue to look good