—Photos: Falcon Heavy's 1st test launch Friday's flight will mark the second Falcon 9 rocket this week for SpaceX. The company launched a different Falcon 9 rocket on Wednesday night (Nov. 10). That rocket, B1067, carried a crew of four astronauts to the International Space Station for SpaceX's six-month Crew-3 mission that is taking place as part of NASA's commercial crew program. Once that rocket successfully launched and returned safely back to Earth, SpaceX's teams at Kennedy started preparing its other rocket for Friday's early morning launch. To ensure that Falcon 9 is ready for its milestone flight tomorrow, SpaceX rolled the rocket out to the pad on Thursday (Nov. 11) and fired up the Falcon's nine Merlin 1D engines as part of a pre-launch test. For this test, known as a static fire test, the rocket was secured to the pad while its engines briefly fired up, allowing engineers to ensure the booster was working properly. Static fire tests are a common part of SpaceX's prelaunch procedures. After the rocket successfully lifts the batch of Starlink satellites into orbit, SpaceX plans to land B1062 on the deck of one of its massive drone ships, named "Just Read the Instructions," which was originally intended to recover the Crew-3 booster on Wednesday night, but SpaceX needed to give the ship's crew a rest since they were stationed out at sea for several days while teams worked to get the Crew-3 mission off the ground. Forecasters at the 45th Space Delta have said that weather for Friday morning's launch may be troublesome, as officials are predicting a 60% chance of favorable conditions for liftoff. The primary concerns being thick clouds and disturbed weather. There is a backup attempt slated for Saturday if necessary, with conditions improving to 80% 'go.' Correction: A previous version of this story included incorrect past flights for the Falcon 9 first stage booster, which made its ninth flight, not fourth, for this launch. It was indeed the 25th launch of 2021 for SpaceX. Follow Amy Thompson on Twitter @astrogingersnap. Follow us on Twitter @Spacedotcom or Facebook. Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community@space.com.