Blue Origin will try, try again to launch its heavy-lift New Glenn rocket to orbit for the first time — if the Florida weather cooperates.

Blue Origin’s New Glenn rocket is slated for its inaugural launch early Thursday morning from the Cape Canaveral Space Force Station. The 3-hour window opened at 1 a.m.

For this uncrewed launch, New Glenn will house the Blue Ring Pathfinder, a payload consisting of a communications array, a power system, and a flight computer. This will let Blue Origin test its Blue Ring spacecraft, which will eventually support missions with refueling, hosting, data relay, and cloud computing capabilities.