Elon Musk stated "It wasn't full power, but it's enough to get to orbit" after Booster 7, a prototype for SpaceX's next-generation Super Heavy rocket booster, shot fire out of Starbase in Texas,
Starship rockets are powered by raptor engines. These engines run on liquid oxygen and cryogenic liquid methane. Cryogenic fuels are those that require low storage temperatures.
During the test, rocket engines are fired up to their maximum thrust. The launch mount supports the launch vehicle securely. During the test, scientists measure temperature, propellant flow gradients and pressure. This is a rehearsal in the rain. The liquid propellants are loaded during this test.