A huge component of a new rocket system has been wheeled slowly from a New Orleans spacecraft factory to a barge that will float it up the Mississippi River for testing.
The recently completed “core stage” of Nasa’s Space Launch System, which dwarfed the hundreds of Nasa and Boeing employees, is to be taken to the Stennis Space Centre in Mississippi, about 50 miles north east of New Orleans.
Space Launch System rockets are expected to eventually take astronauts to the moon as part of Nasa’s Artemis programme.
The core stage – which measures 212ft (65 metres) from end to end and more than 27ft (eight metres) in diameter – was transported like a giant carnival float from the Michoud Assembly Centre in eastern New Orleans to the barge as workers took pictures.
A brass band played and a parade of workers sported Mardi Gras beads.
It will undergo tests at Stennis ahead of the first Artemis launch, currently planned for 2021, said Tony Castilleja, a systems engineer with the Boeing Space Team.
The SLS core stage, with four huge engines, is the largest rocket stage Nasa has assembled since the Apollo stages that first powered crewed missions to the moon.
It will be used for Artemis I, a test flight without a crew.
Artemis II is to send up a crewed spacecraft.
The third mission, Artemis III, would put a man and woman on the south pole of the moon, with an eye towards a continued presence that would lead eventually to a trip to Mars.
Terry Teal, a Nasa employee for 30 years, was among the first sent from Houston to New Orleans to begin work on the SLS rocket eight years ago.
He brought his wife and stepdaughter to witness the roll-out.
Mr Teal said it is an exciting time for those who worked on the rocket and the family members who supported them.
The core stage is the spine of the SLS rocket.
Its four RS-25 engines will produce two million pounds (8.9 million Newtons) of thrust.
The liquid hydrogen tank and liquid oxygen tank hold 733,000 gallons (2.8 million litres) of propellant.
In addition to the tanks, the core stage houses the vehicle’s avionics system, including the flight computers, the vehicle navigation system and the main propulsion system, which feeds propellant to the engines.
Nasa is working to land the first woman and the next man on the moon by 2024.