Why do the spikes that shoot out of stars form perfect crosses?

upload.wikimedia.org/wikipedia/commons/thumb/f/f4/

为什么星星发出的尖峰辐射会形成完美的十字架？

Where do James Webb's unique spikes come from? - Big Think

James Webb captures vast structure created by newborn stars

ELI5: Why does a star or other light source often appear as a cross, in a photo? : r/explainlikeimfive

Astro - Fotosidan

upload.wikimedia.org/wikipedia/commons/thumb/4/47/

How to Make [Legit] Diffraction Spikes on Stars with a Refractor •

Diagnosing Trailed Stars

Example 13 - [1] Steinicke, W. (2010). 'Observing and Cataloguing

How to shoot star trails - Quora