it's called a point spread function; and is an artifact that occurs in any mirror telescope. https://bigthink.com/starts-with-a-bang/james-webb-spikes/ https://

it's called a point spread function; and is an artifact that occurs in any mirror telescope. https://bigthink.com/starts-with-a-bang/james-webb-spikes/ https://bigthink.com/starts-with-a-bang/james-webb-spikes/ explains it pretty well.