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Articles sur Optics

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A light, cheap space telescope design would make it possible to put many individual units in space at once. Katie Yung, Daniel Apai /University of Arizona and AllThingsSpace /SketchFab

A new, thin-lensed telescope design could far surpass James Webb – goodbye mirrors, hello diffractive lenses

Space telescopes are limited in size due to the difficulties and cost of getting into orbit. By revamping an old optical technology, researchers are working on a lightweight and thin telescope design.
Electronic devices are not, in and of themselves, a source of visual problems. Using these devices inappropriately can interfere with the natural development of the eye, as well as reading and learning skills. Shutterstock

Development of vision in early childhood: No screens before age two

The impact of using electronic devices is critical during the first years of life, both visually and on the cognitive and social development of the child.
TRAPPIST-1e is a rocky exoplanet in the habitable zone of a star 40 light-years from Earth and may have water and clouds, as depicted in this artist’s impression. NASA/JPL-Caltech/Wikimedia Commons

To search for alien life, astronomers will look for clues in the atmospheres of distant planets – and the James Webb Space Telescope just proved it’s possible to do so

Life on Earth has dramatically changed the chemistry of the planet. Astronomers will measure light that bounces off distant planets to look for similar clues that they host life.
Reconstruction of the execution of the Arnolfini portrait. Top: Postures of the painter during the painting process. Bottom: views obtained from the four lenses. Université de Lorraine

The mysterious optical device Jan van Eyck may have used to paint his masterpieces – new research

Researchers have long tried to unravel the puzzle of Jan van Eyck’s use of perspective in his masterpiece, the Arnolfini Portrait. New research suggests he may have had help from a novel machine.
The electromagnetic spectrum we can access with current technologies is completely occupied. This means experts have to think of creative ways to meet our rocketing demands for data. NASA Johnson/Flickr

We’re using lasers and toaster-sized satellites to beam information faster through space

Free space optical communication will allow the same connectivity in space we already have on Earth. And this will provide benefits across a number of sectors.
20 tons of Ohara E6 borosilicate glass being loaded onto the mold of one of the GMT’s mirrors. Ray Bertram, Steward Observatory

How do you build a mirror for one of the world’s biggest telescopes?

The laws of physics dictate that to pick out ever fainter objects from space and see them more sharply, we’re going to need a bigger telescope. And that means we need massive mirrors.
A new invisibility cloak can hide objects using an ultrathin layer of nanoantennas that reflect off light. Are humans next? Courtesy of Xiang Zhang group, Berkeley Lab/UC Berkeley

Ten years on, invisibility cloaks are close to becoming a manufacturable reality

Research into invisibility cloaks has been flourishing over the past decade yet they have still not reached the market. But that may be about to change.

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