The pieces of NASA's next-generation moon rocket are coming together — and firing up.
In a wrap-around video released on Tuesday, the space agency showed off the mighty thrust of its RS-25 rocket engine.
Four of these engines will attach to the bottom of NASA's Space Launch System (SLS).
A new bill passed by Congress asks NASA to launch its new rocket and Orion spaceship by 2018. It also calls on the agency to send astronauts to the moon by 2021, and reach Mars by 2033. However, the legislation won't become law until President Trump signs it.
The new video by NASA's Marshall Space Flight Center in Mississippi puts the viewer right in front of a test-firing rig, which rapidly cools down the fiery blast with water. Click and drag the video as it plays to look around the site:
Each RS-25 engine mixes liquid hydrogen and oxygen to produce up to 512,000 pounds of thrust, making for more than 2 million pounds of thrust total on SLS — enough to send more than 10 adult elephants into orbit around Earth.
The engines are 14 feet (4.3 meters) tall and weigh 3.9 short tons (3.5 metric tons).
To get a sense of scale, here's an RS-25 engine being trucked out to the test-firing facility:
The RS-25 engine is a holdover from the Space Shuttle era.
The design has seen so many launches that Aerojet Rocketdyne, its maker, calls it " the world's most reliable rocket booster engine."