Скачать или смотреть Admiring Webb's Gold Mirrors

The golden beauty of the James Webb Space Telescope's mirrors.

The size of Webb's primary mirror — 6.5 meters (21.6 feet) across — was determined by scientists and engineers in order for the telescope to observe distant galaxies at over 13 billion light-years away. The team also decided to make the mirror segments from beryllium, which is both strong and light. Beryllium is a light metal (atomic symbol: Be) that is very strong for its weight and is good at holding its shape across a range of temperatures. Beryllium is also a good conductor of electricity and heat, and is not magnetic.

One of Webb's science goals is to look back through time to when galaxies were young. Webb does this by observing galaxies that are very distant, at over 13 billion light years away from us. To see such far-off and faint objects, Webb needs a large mirror. A telescope’s sensitivity, or how much detail it can see, is directly related to the size of the mirror area that collects light from the objects being observed. A larger area collects more light, just like a larger bucket collects more water in a rain shower than a small one.

Credit: Goddard Space Flight Center; Photographer: Michael McClare; Music: Universal Production Music: Encrypted (2017) Atmosphere Music Ltd. [PRS], Steve Everitt).

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