optics in astronomy

Robert Smith is a professor at the University of Alberta and historian to JWST since 2002

James Webb: An optical success story

As James Webb Space Telescope beams back images from the edge of space and time, space historian Robert Smith recalls some of the decisions made to bring the $10bn NASA project to fruition. David Stuart reports

Top view of the ILMT showing the liquid mercury mirror covered by a thin mylar film. Credit: ARIES, Department of Science and Technology, India

Liquid mirror telescope sees first light in India

Built by astronomers from India, Belgium and Canada, the instrument employs a four-metre-diameter rotating mirror made up of a thin film of liquid mercury

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