Скачать или смотреть The James Webb Space Telescope (JWST) uses a system of segmented mirrors to capture infrared light

The James Webb Space Telescope (JWST) uses a system of segmented mirrors to capture infrared light from distant celestial objects. Here's how they work:

1. Primary Mirror

The primary mirror is made up of 18 hexagonal segments coated with a thin layer of gold to optimize reflectivity for infrared light.

Each segment is about 1.3 meters across, and together, they form a mirror with a total diameter of 6.5 meters.

2. Alignment and Precision

Actuators on each segment adjust the position and curvature of the mirrors with nanometer precision. This ensures all segments work together as a single, smooth surface.

During deployment, the mirrors unfold and align through a process called wavefront sensing and control.

3. Secondary Mirror

A smaller secondary mirror is positioned on a long boom arm in front of the primary mirror.

It reflects light gathered by the primary mirror to the telescope's scientific instruments.

4. Tertiary and Fine Steering Mirrors

Inside the telescope, the tertiary mirror further focuses the light.

A fine steering mirror helps to stabilize the image by correcting for minor vibrations or shifts.

5. Infrared Sensitivity

The mirrors are made of beryllium, which remains stable in extremely cold temperatures.

The telescope operates at cryogenic temperatures, shielded by a sunshield, to detect faint infrared signals without interference from its own heat.

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