Watch NASA's megarocket ace a pivotal thrust test before its moon flight

After completing a dress rehearsal for its first voyage to the moon, NASA's mega rocket is back in its giant garage.

Engineers demonstrated the rocket, known as the Space Launch System, in a series of tests at Kennedy Space Center.

There is a video of the engines doing a little wobble dance.

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A spaceflight's proper trajectory is ensured by an engine's pivot. The direction of the thrust depends on the center of gravity of the vehicle.

The megarocket uses 15 percent more thrust than the previous rocket, the Saturn V, during liftoff and ascent.

The thrust of the four main rocket engines, which were taken from the Space Shuttle, will be enough to keep eight Boeing 747s aloft.

The old 1980s parts were souped up by NASA. They had to be changed to fit the flow rate of fuel.

The four main rocket engines, reused from the Space Shuttle, will be fueled with 700,000 gallons of super cold propellant and produce a thrust powerful enough to keep eight Boeing 747s aloft. Credit: Aerojet Rocketdyne

The first US lunar mission since the Apollo era will be launched by NASA. The new spaceship will be sent around the moon without astronauts for the first time, then splash down in the ocean. The purpose of the flight is to demonstrate that the capsule can hit its target in the water before it carries humans.

It has been a long time since the U.S. space agency had a rocket of this size. One day, it's expected to put the first astronauts on Mars.

The megarocket is one step away from the moon. In the video above, you can see more of her wobbling.

Make 'em back it up.

Two seals associated with hardware that leaked liquid hydrogen during a rehearsal are being worked on by technicians.