Enlarge / A view of the business end of SpaceX's Super Heavy rocket. (credit: SpaceX)

Update, 4:45 pm ET: Well, they did it.

At around 3:15 pm local time in South Texas, SpaceX ignited its Super Heavy rocket for a "full duration" test of its Raptor engines. According to SpaceX founder Elon Musk, the launch team turned off one engine just prior to ignition, and another stopped itself. Still, he said 31 of 33 engines would have provided enough thrust to reach orbit. This is a huge milestone for SpaceX that potentially puts the company on track for an orbital test flight during the second half of March or possibly early April.

This is the most engines ignited on a rocket ever. The thrust output of these engines, too, was likely nearly double that of NASA's Saturn 5 rocket or Space Launch System. The good news for SpaceX is that, at least from early views, the launch infrastructure in South Texas looked mostly unscathed.

Enlarge / A fully stacked Starship launch system is seen on January 9, 2023. (credit: SpaceX)

After months of preparation, SpaceX is now approaching the critical test phase of its launch campaign for the massive Starship vehicle.

The company has evacuated nearby residents from the launch site in South Texas, near Boca Chica Beach, during the hours of 8 am CT (14:00 UTC) to 8 pm CT on Monday. If preparatory activities go well, the company will load both the Starship upper stage and Super Heavy booster with cryogenic methane and oxygen later today. The countdown will proceed toward liftoff but end just before the transfer of internal power to the launch vehicle.

There will be no engine ignition today. However, the upper stage of this vehicle, Ship 24, previously underwent a successful static fire test of its six Raptor rocket engines on September 8, 2022. The first stage, Booster 7, has seen as many as 14 of its 33 Raptor engines test fired during activity in November.