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Update for Dec. 12: This story was updated to reflect U.S. Space Force's most current targeted launch date of Wednesday, Dec. 13.

A SpaceX Falcon Heavy rocket is poised to launch the X-37B space plane for the U.S. Space Force Wednesday (Dec. 13) after several delays, and you can likely watch the action live.

Liftoff of the Falcon Heavy is scheduled to occur from Launch Complex-39A at NASA's Kennedy Space Center in Florida, during a window that opens at 8:13 p.m. EST (0113 GMT Dec. 14). If, as expected, SpaceX webcasts the liftoff, you can watch it live here at Space.com.

SpaceX announced an initial delay of the flight by 24 hours early Sunday (Dec. 10). Then SpaceX scrubbed the planned Monday (Dec. 11) launch of the X-37B space plane due to a ground issue for at least 24 hours. The new launch date was announced on Tuesday (Dec. 12), targeting Wednesday (Dec. 13).

Related: The Space Force's secretive X-37B space plane: 10 surprising facts

The upcoming launch will be the seventh launch to date for the reusable X-37B space plane its first-ever ride on a Falcon Heavy, which could have consequences for its coming orbital mission.

Five of the six X-37B launches to date have employed United Launch Alliance Atlas V rockets, with one other using a SpaceX Falcon 9. Falcon Heavy, which utilizes three Falcon 9 boosters as its first stage, outclasses both of those other rockets when it comes to getting mass to orbit. According to a recent Space Force release, some of the objectives of the coming X-37B mission, known as OTV-7 ("Orbital Test Vehicle-7"), include "operating in new orbital regimes," which, given the launch vehicle, may indicate a higher orbit than usual, farther from Earth.

The upgrade in launch vehicle may also have to do with mass. The X-37B features a cargo bay to house equipment and experiments, and it could be carrying a secondary mission payload that requires Falcon Heavy's added lift capability.

The uncertainty here is not surprising; most details of X-37B missions are classified. However, USSF-52 does carry at lease one unclassified experiment: NASA's "Seeds-2" project, which will test the effects of radiation and long-duration spaceflight on plant seeds.

Each successive X-37B mission has been longer than its predecessors, with its most recent orbital jaunt lasting 908 days. That mission, called OTV-6, landed in November 2022.

When Falcon Heavy launches on Sunday, it will be the rocket's ninth mission to date. It will also be the fifth flight for the side boosters supporting this particular mission; the duo most recently launched NASA's Psyche probe, in October of this year.

Editor's note: This story was updated on Dec. 10 to reflect SpaceX's one-day delay of the launch of the Falcon Heavy and X-37B. It was also updated to reflect the scrubbed launch Dec. 11 and the new launch window announced Dec. 12.

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SpaceX Falcon Heavy rocket to launch secretive X-37B space plane Dec. 13 after delay - Space.com