MOONS, a next generation spectrograph designed and built in Edinburgh, has officially begun its journey from Scotland to South America, marking a milestone moment for British science and engineering.
After more than a decade of development, the Multi Object Optical and Near infrared Spectrograph departed the UK Astronomy Technology Centre in Edinburgh and is now en route to the European Southern Observatory’s Paranal site in Chile.
Set for a 7,000 mile sea voyage, the instrument will eventually be installed on ESO’s Very Large Telescope, where it is expected to capture first light in 2026.
A major international achievement
Constructed by an international consortium led by the Science and Technology Facilities Council’s UK ATC at the Royal Observatory Edinburgh, MOONS stands as the largest and most complex astronomy instrument ever built in the United Kingdom. Capable of observing up to 1,000 celestial objects simultaneously, it promises new insight into how galaxies form and evolve across cosmic time.
Its departure signals the final stage before integration with the VLT, a landmark moment for the global astronomy community and a point of pride for the UK teams who led the project.
Ten tonnes of precision engineering
Towering 4.5 metres high and weighing 10 tonnes, MOONS required a careful and highly coordinated extraction from the Edinburgh site. Engineers packaged the equipment into 15 custom built containers, the packaging itself weighing an additional 4 tonnes.
Three articulated lorries carried the cargo south to Southampton. The largest component, a 7 tonne spectrograph, required a stop in Glasgow where it was rotated onto its side and secured at a specialist facility ahead of its sea journey.
A voyage to one of the world’s leading observatories
All components will be consolidated in Southampton before being loaded onto a single heavy transport trailer and shipped to Chile. Arrival is scheduled for January 2026, followed by a 350 mile overland trek to the VLT site high in the Atacama Desert.
Once at Paranal, the instrument will undergo around five months of integration and testing before astronomers prepare for its first observations in summer 2026.
A moment of pride for British science
Dr Oscar Gonzalez, Head of Project Science at UK ATC and UK Principal Investigator of MOONS, said:
“Watching MOONS leave Edinburgh was a proud and emotional moment for our team. This instrument represents years of work and dedication by many outstanding people. Building MOONS was one challenge, moving it across the globe and installing it at the VLT is another. The logistics are remarkably complex, and we worked closely with specialists to ensure this unique instrument reaches Chile securely, ready to be installed and see its first light.”
Dr Suzanne Ramsay, ESO Deputy Instrumentation Programme Manager, said:
“The ESO team has been really impressed by both the instrument and the dedication of the MOONS team. We look forward to the installation on Cerro Paranal in keen anticipation of the scientific discoveries to come.”
Professor Christophe Dumas, Director at UK ATC, added:
“Seeing MOONS begin its journey is a moment of pride for everyone at UK ATC. This instrument will soon become a key part of the Very Large Telescope, enabling astronomers to explore the Universe in ways we have never achieved before. We are excited for the discoveries that lie ahead and the new questions they will inspire.”
An international partnership
The MOONS project brought together institutions from the UK, Italy, France, Portugal, Switzerland and Chile, as well as ESO. UK ATC led the overall project office and engineered several core components including the fibre positioner units, calibration unit, cryostat, detector adjustment modules and metrology camera system.
Partners across Europe contributed essential systems, from opto mechanical camera assemblies at the University of Cambridge to optical design and grating mechanisms at INAF Firenze. INAF Roma delivered the acquisition camera system and full instrument modelling, while INAF Milano led software for observation planning.
The University of Geneva and UK ATC provided instrument control electronics. GEPI Paris supplied the fibre assembly, slit and shutters and data reduction software. ESO delivered detector arrays and CCDs, and the control software was jointly developed by Pontificia Universidad Catolica de Chile, BlueShadows Ltd and UK ATC.
Integrated in Britain, built for the world
All components were finally brought together and tested in Edinburgh. MOONS will give astronomers the tools to survey millions of stars and galaxies, mapping the structure of the Milky Way and tracing the evolution of galaxies across the Universe.
As the instrument heads south across the Atlantic, it carries not only the promise of scientific discovery but also a clear demonstration of Britain’s enduring strength in engineering, innovation and international leadership in astronomy.
