![Different views of one of two optic units onboard NuSTAR, each consisting of 133 nested cylindrical mirror shells as thin as a fingernail. The mirrors are arranged in this way in order to focus as much X-ray light as possible.](https://appel.nasa.gov/wp-content/uploads/2013/05/03_653972main_pia15631-43_full-670x380.jpg)
Precision and Efficiency: Building NuSTAR’s Mirrors
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By William W. Zhang Many NASA projects involve designing and building one-of-a-kind spacecraft and instruments. Created for particular, unique missions, they are custom-made, more like works of technological art than manufactured objects.