The James Webb Space Telescope is an engineering marvel, the largest telescope ever put into space, orbiting beyond Earth's Moon at temperatures near absolute zero — the point at which all motion ceases. It's finely crafted to handle the rigors of space and, in many cases, turn them to its advantage. Explore the creativity and innovation that paved the way to Webb's birth.

Webb's designers have tackled issues that other telescopes never had to consider. Get an in-depth look at the workings of the infrared telescope that will see farther than ever before, follow Webb's technological leaps, and explore some of the features that make the telescope special.

Technology Overview A detailed summary of how Webb works and the needs behind its design.
Tech Showcase

These special features highlight some of Webb's most unique technology.

Doors to the Universe Microshutters — tiny doors smaller than your average speck of dust — make a powerful camera 100 times more effective.
Challenge: Make It Big sizing up the skies Webb is a colossal space telescope, the largest ever put into space. Learn why Webb's size matters, and how engineers are meeting that challenge.
Challenge: Keep It Cold a chilly reception Webb has to be kept as far as possible from sources of warmth. Find out why, and hear how engineers are beating the heat.