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

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

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Why Do The Spikes That Shoot Out Of Stars Form Perfect Crosses? - Ask an Astronomer

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What is a Diffraction Spike?

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What are the 6 spikes seemingly emitting from stars in

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