There are strange "zebra" patterns coming from the Crab Nebula, and the reason has to do with plasma refraction.

Strange 'zebra' patterns are coming from the Crab Nebula — this physicist finally figured out why

Source: space
Source Link: https://www.space.com/the-universe/strange-zebra-patterns-are-coming-from-the-crab-nebula-this-physicist-finally-figured-out-why