A giant telescope lens made by a Denbighshire firm is helping US scientists monitor rogue asteroids on a collision course with Earth.
The 1.2m (47in) lens made at Technium OpTIC, based at St Asaph, is being installed at the University of Hawaii.
The Nasa-run Pan STARRS project (PANoramic Survey Telescope & Rapid Response System) aims to track objects as small as 300m (330 yards) across.
Images from the lens are recorded by a 1.4 billion-pixel digital camera.
A growing number of scientists are taking seriously the threat posed to the planet by an asteroid collision.
"Millions of these near-Earth objects pass through our solar system every year - if only one hit us, we'd have a big problem"
In 2005, NASA was given the task of detecting 90% of near-Earth objects with a size greater than 140m in diameter by the year 2020.
The agency estimates there are about 20,000 undiscovered potentially-threatening asteroids.
The Pan-STARRS project is capable of detecting objects 300m in diameter - large enough to have catastrophic consequences.
John Oliver, of Technium OpTIC, based on St Asaph Business Park, said the research programme in Hawaii contacted them because of a worldwide manufacturing shortfall in the type of lens used.
He said: "All our tests on the lens showed that it should perform they way they are looking for.
"Millions of these near-Earth objects pass through our solar system every year. If only one hit us, we'd have a big problem."
He said the company had a new machine which enabled them to polish the lenses to the high standard and tolerance Nasa required.
Lembit Opik, MP for Montgomeryshire, has called on the UK government to devise a plan to combat the threat of asteroids.
He welcomed the firm's involvement with the project, adding: "I regard this initiative as part of our global insurance policy against cosmic catastrophe."
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