Europe shipped one of its big contributions to the James Webb Space Telescope (JWST) on Tuesday.
The Mid Infra-Red Instrument (Miri) was flown out of London Heathrow on a British Airways jet, bound for Nasa's Goddard Space Flight Center.
JWST will be the successor to Hubble, and aims to track down the very first stars to shine in the Universe.
Miri has been built by a pan-European consortium led from the UK and Nasa's Jet Propulsion Laboratory (JPL).
It will play a central role in the quest to identify that "first light".
The 120m-euro (?95m; $150m) instrument, tucked inside its protective box, was loaded on to BA flight 217 for Washington Dulles International Airport.
The ride across the Atlantic was due to last about 7.5 hours.
On landing, Miri will be driven the relatively short distance around the US capital's "Beltway" to Goddard where it will be unpacked on Wednesday.
Nasa engineers will then integrate Miri into the telescope structure prior to further testing.
Webb's launch is planned for 2018.
"Miri's box is a standard environment-controlled air-freight container, but we built a special structure inside to hold this incredibly valuable instrument," explained Piyal Samara-Ratna, the mechanical engineer from Leicester University overseeing the transfer.
"It has vibration isolating mounts to prevent any shock loads going through Miri. We also have sensors in there as well, so we would know if it got bumped.
"It's impossible to insure something like Miri, which represents the time and effort of so many people in Europe and the United States."
BBC correspondent Jonathan Amos gets to see the Mid Infra-Red Instrument (Miri) close up before its shipment to the US
JWST is a Nasa project, with key inputs from the European and Canadian space agencies.
As well as two of its four instruments, Europe is providing the Ariane 5 rocket to put the observatory in space.
The telescope is a huge technological challenge.
It will carry a 6.5m primary mirror (more than double the width of Hubble's main mirror), and this must be folded to fit inside the Ariane launcher. So too must the giant sunshield that will protect Webb's sensitive vision.
The telescope is being tuned to see the cosmos in the infrared. This is the part of the electromagnetic spectrum in which the first luminous objects - the first stars and galaxies - should be detectable.
Miri was sent to Heathrow from the Rutherford Appleton Laboratory in Oxfordshire where its final assembly took place.
It was accompanied by 15 other boxes of support equipment.
The main container carried the flags of all the European nations that have worked on the instrument and the signatures of its principal scientist, Prof Gillian Wright, and its project manager, John Thatcher from the Astrium space company. A message read simply, "First and best".
It is expected the other Webb instruments will also finish their builds very shortly.
- James Webb's main mirror has around seven times more collecting area than Hubble's 2.4m primary mirror
- The sunshield is about 22m by 12m. There will be a 300-degree difference in temperature between the two sides
- James Webb's instruments must be very cold to ensure their own infrared glow does not swamp the observations
- The mission will launch in 2018 on an Ariane rocket. The observing position will be 1.5 million km from Earth
Jonathan.Amos-INTERNET@bbc.co.uk and follow me on Twitter
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