The James Webb Space Telescope: How It Was Built, Works, and Why Took Twenty-Five Years, Ten Billion Dollars, 344 Steps That Could Not Fail

On Christmas morning of 2021 a rocket stage released an object weighing 6,161 kilograms that had cost 9.7 billion dollars and taken twenty-five years to build. It was folded. Over the next month, a million miles from Earth, it had to open itself through 344 points where one failure would end it.Other books about this telescope tell the story or collect the pictures. This one explains the machine: 131 figures drawn for it, 83 of them diagrams and charts built from published numbers, over 272 pages. Every constraint traces back to a physical fact, and facts can be drawn.Inside, you'll find: - The gold, weighed. 48.25 grams, less than a sixth of a tablespoon, across 25.4 square meters. NASA's own page calls that much gold the size of a golf ball, which would weigh 790 grams.- A sunshield bigger than advertised. 300.2 square meters against a doubles tennis court's 260.8. Five layers hold 383 kelvin on one face and 36 on the other, 347 degrees across a stack as thick as two sheets of paper.- Why the odds were bad. 178 release mechanisms in series. At 99 percent each, the chain works 16.7 percent of the time.- Where the ten billion went. The one-billion figure everyone quotes was a 2001 concept target. NASA's first commitment was 4.964 billion.- Where the reporting went wrong. The K2-18 b claim, from measurement to headline to reanalysis, with the verdict left where the evidence leaves it.There are no photographs in it. This is a book about how the telescope works, not what it has seen, and it assumes no physics.They all worked. This book is about why that was hard.